February 1, 2023
Mozilla added the WebExtensions API to Firefox a few years ago, allowing browser extensions made for Chrome to work on Firefox with minimal (if any) work. Firefox 109 is now rolling out, with a few changes to extension support. Google started rolling out a new platform for extensions in Chrome at the end of 2020,…

Mozilla added the WebExtensions API to Firefox a few years ago, allowing browser extensions made for Chrome to work on Firefox with minimal (if any) work. Firefox 109 is now rolling out, with a few changes to extension support.

Google started rolling out a new platform for extensions in Chrome at the end of 2020, known as Manifest V3. It’s a significant change to how browser extensions function, with the goal of making them safer and less resource-intensive. Some APIs were removed and replaced with less-powerful alternatives, which affected content blockers like uBlock Origin — sparking some public outage from users and extension developers alike. Last month, Google delayed the timeline for removing older Manifest V2 extensions from the Chrome Web Store.

Firefox 109 is now available, and the main new feature on desktop platforms is initial support for Manifest V3 extensions. That means extensions created for newer versions of Chrome and Microsoft Edge should still work in Firefox, but Mozilla isn’t removing some features, and will continue supporting older extensions for the foreseeable future.

Mozilla said in a blog post, “we agreed…

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