Open Source JavaScript Browser Extensions and Plugins

Stackpeek is a free, open-source browser extension that shows what any Shopify storefront is built on. Click its icon and a side panel names the theme -- with its version, creator and price -- the apps behind the store, grouped by the job they do, and the advertising and analytics pixels the page loads, each named rather than counted as a total. It also exports the store's public product catalogue to CSV in Shopify's own product-import format: every public product and variant, up to the first 10,000, assembled in your browser. Detection is reported honestly. Weak app matches are marked unverified rather than dropped, unknown hosts are counted so gaps stay visible, and a customized, bespoke or headless build is labelled as such instead of being guessed at. Four permissions, no account, no sign-up, and your browsing history is not collected. The full source is MIT licensed and published, so every claim here is checkable against the code. Not affiliated with Shopify Inc.

Juruti is a Firefox add-on that lets you use amazon's website to shop at your local book shop. Just fill your shopping cart (you don't need an amazon account to do that) and then, instead of checking out, hit the Juruti button. An e-mail listing all your selected products will be created that you can send to your local book shop.