Firefox’s version 109 update, released on Tuesday, includes a new extensions system that sparked years of controversy when it was adopted for Google Chrome, due to the fact that it nerfed some ad-blockers.In a Tuesday blog post explaining the new extensions system, Mozilla says it adopted Manifest Version 3 to make things a lot easier for people developing extensions for both Chrome and Firefox.Google also cited those areas when it added Manifest V3 to Chrome in 2021, calling the move “part of a shift in the philosophy behind user security and privacy.” But one of the changes in the update broke features in several popular content and ad-blocking extensions by removing a feature they used to block certain network requests (be those to trackers, advertisers, or anyone else).I won’t go too deep into how it did that — we have an explainer that goes into the technical side of things — but the high-level takeaway is that Mozilla’s version of Manifest V3 keeps the feature Google removed, while adding support for the more limited replacement as well.One of the panel’s features is that it lets you quickly see what permissions an extension has on a specific webpage, and potentially even manage them if the extension supports it."