What Is a Browser Hijacker?
Last Updated :
23 Jul, 2025
A browser hijacker is an internet browser hacker that occurs when malicious software infects an internet browser and affects the way it operates. Internet browsers perform as a "window" to the internet, allowing users to search for, view, and interact with content. Some hijackers also include keyloggers which may record user keystrokes and collect potentially useful information, such as account credentials, from websites.
What Is a Browser Hijacker?
Browser hijackers manipulate your browser's settings to change its functionality. You may notice a new home page, a new toolbar, or a change to your usual search engine. These alterations will cause bogus items to appear in online search results and route you to specified domains (via a virus). The hijackers can modify your computer's registry, making them harder to uninstall. However, some are known to insert advertisements, therefore they are classified as adware, automatically diverting users to potentially harmful destinations when they visit particular websites and, in some cases, causing significant alterations to the infected system.
How to Tell if You Have a Browser Hijacker?
If your web browser is acting strangely, you might have a browser hijacker. Look out for these signs: your searches go to weird websites, lots of pop-up ads show up, web pages load slowly, your usual search engine has changed, or new toolbars appear that you didn't add. But sometimes, you might not notice anything wrong. Some sneaky hijackers try to stay hidden while they watch what you do online and gather your information. If you see any of these problems, it's a good idea to check your browser for possible hijackers.
Impact of Browser Hijackers
Change your browser
The hijacker might send you to different websites than you want. This often helps the hacker make money from ads or fake traffic. For example, you might try to go to your favorite news site but end up on a page full of ads instead.
Add unwanted toolbars
You might see new toolbars or add-ons in your browser that you didn't install. These can be hard to get rid of and might slow down your browsing. They could change your homepage or default search engine without your permission.
Watch what you do online
Some hijackers can put spy software on your device. This lets them see where you go online, what you search for, and what you like to do. They might use this information to show you targeted ads or even sell your data to others.
Show lots of ads
Hijackers might add software that fills your screen with ads. This can make your device slow and hard to use. The ads might pop up even when you're not browsing, or they could cover important parts of websites you're trying to view.
Steal your identity
In the worst cases, hackers might use the hijacker to get into your whole device. They could then try to steal your personal information like passwords, bank details, or credit card numbers. This could lead to financial loss or identity theft.
Damage your computer
Some hijackers can download more harmful software onto your device. This might make your computer run slowly, crash often, or even stop working altogether.
Warning Signs of Browser Hijackers
Redirected searches
When you try to go to a website, you end up on a different one instead. This new site might not be safe. For example, you might search for "cats" but end up on a site selling fake products.
Frequent pop-ups
You see many pop-up ads when you're online. These are annoying and might be dangerous if you click on them. They could appear even when you're not on shopping sites.
Slow loading
Web pages take a long time to open, or don't open at all. This might happen because something bad is using up your computer's power. Your browser might freeze or crash more often than usual.
Unwanted extensions
You see new tools or add-ons in your browser that you didn't put there yourself. These appeared without you knowing. They might change how your browser looks or works. For example, you might see a new search bar or buttons you don't recognize.
Examples of Browser Hijackers
CoolWebSearch
CoolWebSearch is a spyware or virus application that installs on Microsoft Windows-based systems. CoolWebSearch sends queries to their pay-per-click search engine and also tracks your search history. CoolWebSearch may even modify your browser's bookmarks and history to add its sponsor's online websites.
GoSave
GoSave is a plug-in that purports to provide great discounts when you purchase online, but it integrates adverts into every part of your browser, including your search results. Clicking on a GoSave ad might result in more adware or other infestations.
RocketTab
RocketTab is an adware that pretends to help you search the internet more successfully but instead swamps you with advertising banners, converts site text into product hyperlinks, and bombards you with pop-ups for questionable software.
Ask Toolbar
The Ask toolbar is an online search engine and toolbar that is included with other free apps like Java or an Adobe update. It then replaces your preferred search engine and changes your home page.
How to Prevent Browser Hijacking?
Keep your software up to date
Only get apps from trusted places like the Microsoft Store, Google Play, or the App Store. Or go to websites you trust to download their programs directly. Look for "https" in the website address to make sure it's secure.
Avoid suspicious links and attachments
Free programs might have hidden dangers. Sometimes, they come with unwanted extras that can take over your browser. Read the installation screens carefully and uncheck any boxes for extra toolbars or programs you don't want.
Use a secure browser
Pick a browser that's made to be secure, like Norton Secure Browser. These are built to keep you safer online. They often have built-in protection against phishing and malware.
Install antivirus
Good antivirus software can stop dangerous downloads before they harm your computer. Make sure to keep it updated and run regular scans of your system.
Be cautious with pop-ups
If you see a pop-up telling you to download something to view a page, don't do it. This is often a trick to install unwanted software.
Conclusion
A browser hijacker can change the appearance or behavior of your browser, or both. Visual clues may include a fresh home page. Browser hijackers hide as, Browser hijackers are typically deployed by Potentially Unwanted Applications (PUAs), which can be found within legal applications/websites.
Similar Reads
Computer Network Tutorial A Computer Network is a system where two or more devices are linked together to share data, resources and information. These networks can range from simple setups, like connecting two devices in your home, to massive global systems, like the Internet. Below are some uses of computer networksSharing
6 min read
Computer Network Basics
Basics of Computer NetworkingA computer network is a collection of interconnected devices that share resources and information. These devices can include computers, servers, printers, and other hardware. Networks allow for the efficient exchange of data, enabling various applications such as email, file sharing, and internet br
10 min read
Types of Computer NetworksA computer network is a system that connects many independent computers to share information (data) and resources. The integration of computers and other different devices allows users to communicate more easily. It is a collection of two or more computer systems that are linked together. A network
7 min read
Introduction to InternetComputers and their structures are tough to approach, and it is made even extra tough when you want to recognize phrases associated with the difficulty this is already utilized in regular English, Network, and the net will appear to be absolutely wonderful from one some other, however, they may seem
10 min read
Types of Network TopologyNetwork topology refers to the arrangement of different elements like nodes, links, or devices in a computer network. Common types of network topology include bus, star, ring, mesh, and tree topologies, each with its advantages and disadvantages. In this article, we will discuss different types of n
11 min read
Network DevicesNetwork devices are physical devices that allow hardware on a computer network to communicate and interact with each other. Network devices like hubs, repeaters, bridges, switches, routers, gateways, and brouter help manage and direct data flow in a network. They ensure efficient communication betwe
9 min read
What is OSI Model? - Layers of OSI ModelThe OSI (Open Systems Interconnection) Model is a set of rules that explains how different computer systems communicate over a network. OSI Model was developed by the International Organization for Standardization (ISO). The OSI Model consists of 7 layers and each layer has specific functions and re
13 min read
TCP/IP ModelThe TCP/IP model is a framework that is used to model the communication in a network. It is mainly a collection of network protocols and organization of these protocols in different layers for modeling the network.It has four layers, Application, Transport, Network/Internet and Network Access.While
7 min read
Difference Between OSI Model and TCP/IP ModelData communication is a process or act in which we can send or receive data. Understanding the fundamental structures of networking is crucial for anyone working with computer systems and communication. For data communication two models are available, the OSI (Open Systems Interconnection) Model, an
4 min read
Physical Layer
Physical Layer in OSI ModelThe physical Layer is the bottom-most layer in the Open System Interconnection (OSI) Model which is a physical and electrical representation of the system. It consists of various network components such as power plugs, connectors, receivers, cable types, etc. The physical layer sends data bits from
4 min read
Types of Network TopologyNetwork topology refers to the arrangement of different elements like nodes, links, or devices in a computer network. Common types of network topology include bus, star, ring, mesh, and tree topologies, each with its advantages and disadvantages. In this article, we will discuss different types of n
11 min read
Transmission Modes in Computer Networks (Simplex, Half-Duplex and Full-Duplex)Transmission modes also known as communication modes, are methods of transferring data between devices on buses and networks designed to facilitate communication. They are classified into three types: Simplex Mode, Half-Duplex Mode, and Full-Duplex Mode. In this article, we will discuss Transmission
6 min read
Types of Transmission MediaTransmission media is the physical medium through which data is transmitted from one device to another within a network. These media can be wired or wireless. The choice of medium depends on factors like distance, speed, and interference. In this article, we will discuss the transmission media. In t
9 min read
Data Link Layer
Data Link Layer in OSI ModelThe data link layer is the second layer from the bottom in the OSI (Open System Interconnection) network architecture model. Responsible for the node-to-node delivery of data within the same local network. Major role is to ensure error-free transmission of information. Also responsible for encoding,
4 min read
What is Switching?Switching is the process of transferring data packets from one device to another in a network, or from one network to another, using specific devices called switches. A computer user experiences switching all the time for example, accessing the Internet from your computer device, whenever a user req
5 min read
Virtual LAN (VLAN)Virtual LAN (VLAN) is a concept in which we can divide the devices logically on layer 2 (data link layer). Generally, layer 3 devices divide the broadcast domain but the broadcast domain can be divided by switches using the concept of VLAN. A broadcast domain is a network segment in which if a devic
7 min read
Framing in Data Link LayerFrames are the units of digital transmission, particularly in computer networks and telecommunications. Frames are comparable to the packets of energy called photons in the case of light energy. Frame is continuously used in Time Division Multiplexing process. Framing is a point-to-point connection
6 min read
Error Control in Data Link LayerData-link layer uses the techniques of error control simply to ensure and confirm that all the data frames or packets, i.e. bit streams of data, are transmitted or transferred from sender to receiver with certain accuracy. Using or providing error control at this data link layer is an optimization,
4 min read
Flow Control in Data Link LayerFlow control is design issue at Data Link Layer. It is a technique that generally observes the proper flow of data from sender to receiver. It is very essential because it is possible for sender to transmit data or information at very fast rate and hence receiver can receive this information and pro
4 min read
Piggybacking in Computer NetworksPiggybacking is the technique of delaying outgoing acknowledgment temporarily and attaching it to the next data packet. When a data frame arrives, the receiver waits and does not send the control frame (acknowledgment) back immediately. The receiver waits until its network layer moves to the next da
5 min read
Network Layer
Network Layer in OSI ModelThe Network Layer is the 5th Layer from the top and the 3rd layer from the Bottom of the OSI Model. It is one of the most important layers which plays a key role in data transmission. The main job of this layer is to maintain the quality of the data and pass and transmit it from its source to its de
5 min read
Introduction of Classful IP AddressingClassful IP addressing is an obsolete method for allocating IP addresses and dividing the available IP address space across networks. It was used from 1981 to 1993 until the introduction of CIDR (Based on Prefixes rather than classes). Classful method categorizes IP addresses into five classes (A, B
10 min read
Classless Addressing in IP AddressingThe Network address identifies a network on the internet. Using this, we can find a range of addresses in the network and total possible number of hosts in the network. Mask is a 32-bit binary number that gives the network address in the address block when AND operation is bitwise applied on the mas
7 min read
What is an IP Address?Imagine every device on the internet as a house. For you to send a letter to a friend living in one of these houses, you need their home address. In the digital world, this home address is what we call an IP (Internet Protocol) Address. It's a unique string of numbers separated by periods (IPv4) or
14 min read
IPv4 Datagram HeaderIP stands for Internet Protocol and v4 stands for Version Four (IPv4). IPv4 was the primary version brought into action for production within the ARPANET in 1983. IP version four addresses are 32-bit integers which will be expressed in decimal notation. In this article, we will discuss about IPv4 da
4 min read
Difference Between IPv4 and IPv6IPv4 and IPv6 are two versions of the system that gives devices a unique address on the internet, known as the Internet Protocol (IP). IP is like a set of rules that helps devices send and receive data online. Since the internet is made up of billions of connected devices, each one needs its own spe
7 min read
Difference between Private and Public IP addressesIP Address or Internet Protocol Address is a type of address that is required to communicate one computer with another computer for exchanging information, file, webpage, etc. Public and Private IP address are two important parts of device identity. In this article, we will see the differences betwe
6 min read
Introduction To SubnettingSubnetting is the process of dividing a large network into smaller networks called "subnets." Subnets provide each group of devices with their own space to communicate, which ultimately helps the network to work easily. This also boosts security and makes it easier to manage the network, as each sub
8 min read
What is Routing?The process of choosing a path across one or more networks is known as Network Routing. Nowadays, individuals are more connected on the internet and hence, the need to use Routing Communication is essential.Routing chooses the routes along which Internet Protocol (IP) packets get from their source t
10 min read
Network Layer ProtocolsNetwork Layer is responsible for the transmission of data or communication from one host to another host connected in a network. Rather than describing how data is transferred, it implements the technique for efficient transmission. In order to provide efficient communication protocols are used at t
9 min read
Transport Layer
Session Layer & Presentation Layer
Session Layer in OSI modelThe Session Layer is the 5th layer in the Open System Interconnection (OSI) model which plays an important role in controlling the dialogues (connections) between computers. This layer is responsible for setting up, coordinating, and terminating conversations, exchanges, and dialogues between the ap
6 min read
Presentation Layer in OSI modelPresentation Layer is the 6th layer in the Open System Interconnection (OSI) model. This layer is also known as Translation layer, as this layer serves as a data translator for the network. The data which this layer receives from the Application Layer is extracted and manipulated here as per the req
4 min read
Secure Socket Layer (SSL)SSL or Secure Sockets Layer, is an Internet security protocol that encrypts data to keep it safe. It was created by Netscape in 1995 to ensure privacy, authentication, and data integrity in online communications. SSL is the older version of what we now call TLS (Transport Layer Security).Websites us
10 min read
PPTP Full Form - Point-to-Point Tunneling ProtocolPPTP Stands for Point-to-Point Tunneling Protocol is a widely used networking protocol designed to create a secure private connection over a public network like the internet. It is Developed by Microsoft and other tech companies in the 1990s It is one of the first protocols used for Virtual Private
5 min read
Multipurpose Internet Mail Extension (MIME) ProtocolMIME (Multipurpose Internet Mail Extensions) is a standard used to extend the format of email messages, allowing them to include more than just text. It enables the transmission of multimedia content such as images, audio, video, and attachments, within email messages, as well as other types of cont
4 min read
Application Layer
Application Layer in OSI ModelThe Application Layer of OSI (Open System Interconnection) model, is the top layer in this model and takes care of network communication. The application layer provides the functionality to send and receive data from users. It acts as the interface between the user and the application. The applicati
5 min read
Client-Server ModelThe Client-Server Model is a distributed architecture where clients request services and servers provide them. Clients send requests to servers, which process them and return the results. Clients don’t share resources among themselves but depend on the server. Common examples include email systems a
5 min read
World Wide Web (WWW)The World Wide Web (WWW), often called the Web, is a system of interconnected webpages and information that you can access using the Internet. It was created to help people share and find information easily, using links that connect different pages together. The Web allows us to browse websites, wat
6 min read
Introduction to Electronic MailIntroduction:Electronic mail, commonly known as email, is a method of exchanging messages over the internet. Here are the basics of email:An email address: This is a unique identifier for each user, typically in the format of [email protected] email client: This is a software program used to send,
4 min read
What is a Content Distribution Network and how does it work?Over the last few years, there has been a huge increase in the number of Internet users. YouTube alone has 2 Billion users worldwide, while Netflix has over 160 million users. Streaming content to such a wide demographic of users is no easy task. One can think that a straightforward approach to this
4 min read
Protocols in Application LayerThe Application Layer is the topmost layer in the Open System Interconnection (OSI) model. This layer provides several ways for manipulating the data which enables any type of user to access the network with ease. The Application Layer interface directly interacts with the application and provides c
7 min read
Advanced Topics
What is Network Security?Network security is defined as the activity created to protect the integrity of your network and data. Network security is the practice of protecting a computer network from unauthorized access, misuse, or attacks. It involves using tools, technologies, policies and procedures to ensure the confiden
9 min read
Computer Network | Quality of Service and MultimediaQuality of Service (QoS) is an important concept, particularly when working with multimedia applications. Multimedia applications, such as video conferencing, streaming services, and VoIP (Voice over IP), require certain bandwidth, latency, jitter, and packet loss parameters. QoS methods help ensure
7 min read
Authentication in Computer NetworkPrerequisite - Authentication and Authorization Authentication is the process of verifying the identity of a user or information. User authentication is the process of verifying the identity of a user when that user logs in to a computer system. There are different types of authentication systems wh
4 min read
Encryption, Its Algorithms And Its FutureEncryption plays a vital role in today’s digital world, serving a major role in modern cyber security. It involves converting plain text into cipher text, ensuring that sensitive information remains secure from unauthorized access. By making data unreadable to unauthorized parties, encryption helps
10 min read
Introduction of Firewall in Computer NetworkA firewall is a network security device either hardware or software-based which monitors all incoming and outgoing traffic and based on a defined set of security rules it accepts, rejects, or drops that specific traffic. It acts like a security guard that helps keep your digital world safe from unwa
10 min read
MAC Filtering in Computer NetworkThere are two kinds of network Adapters. A wired adapter allows us to set up a connection to a modem or router via Ethernet in a computer whereas a wireless adapter identifies and connects to remote hot spots. Each adapter has a distinct label known as a MAC address which recognizes and authenticate
10 min read
Wi-Fi Standards ExplainedWi-Fi stands for Wireless Fidelity, and it is developed by an organization called IEEE (Institute of Electrical and Electronics Engineers) they set standards for the Wi-Fi system. Each Wi-Fi network standard has two parameters : Speed - This is the data transfer rate of the network measured in Mbps
4 min read
What is Bluetooth?Bluetooth is used for short-range wireless voice and data communication. It is a Wireless Personal Area Network (WPAN) technology and is used for data communications over smaller distances. This generation changed into being invented via Ericson in 1994. It operates within the unlicensed, business,
6 min read
Generations of wireless communicationWe have made very huge improvements in wireless communication and have expanded the capabilities of our wireless communication system. We all have seen various generations in our life. Let's discuss them one by one. 0th Generation: Pre-cell phone mobile telephony technology, such as radio telephones
2 min read
Cloud NetworkingCloud Networking is a service or science in which a company’s networking procedure is hosted on a public or private cloud. Cloud Computing is source management in which more than one computing resources share an identical platform and customers are additionally enabled to get entry to these resource
11 min read
Practice
Top 50 Plus Networking Interview Questions and Answers for 2024Networking is defined as connected devices that may exchange data or information and share resources. A computer network connects computers to exchange data via a communication media. Computer networking is the most often asked question at leading organizations such Cisco, Accenture, Uber, Airbnb, G
15+ min read
Top 50 TCP/IP Interview Questions and Answers 2025Understanding TCP/IP is essential for anyone working in IT or networking. It's a fundamental part of how the internet and most networks operate. Whether you're just starting or you're looking to move up in your career, knowing TCP/IP inside and out can really give you an edge.In this interview prepa
15+ min read
Top 50 IP Addressing Interview Questions and AnswersIn today’s digital age, every device connected to the internet relies on a unique identifier called an IP Address. If you’re aiming for a career in IT or networking, mastering the concept of IP addresses is crucial. In this engaging blog post, we’ll explore the most commonly asked IP address intervi
15+ min read
Last Minute Notes for Computer NetworksComputer Networks is an important subject in the GATE Computer Science syllabus. It encompasses fundamental concepts like Network Models, Routing Algorithms, Congestion Control, TCP/IP Protocol Suite, and Network Security. These topics are essential for understanding how data is transmitted, managed
14 min read
Computer Network - Cheat SheetA computer network is an interconnected computing device that can exchange data and share resources. These connected devices use a set of rules called communication protocols to transfer information over physical or wireless technology. Modern networks offer more than just connectivity. Enterprises
15+ min read