Firefox last major browser supporting uBlock Origin
Archived — this story has rotated out of today’s deck. It is kept here in full.
The gist
Firefox remains the last major browser supporting uBlock Origin as Chrome and Edge phase it out. Users who rely on full ad-blocking must switch or compromise.
Background
Google Chrome and Microsoft Edge are transitioning to Manifest V3 (MV3), which restricts the webRequestBlocking capability that uBlock Origin relies on. Mozilla Firefox, based on Gecko, continues to support this capability, making it the only major browser that still fully supports the original uBlock Origin extension. This change is part of a broader industry shift that affects many extensions, but uBlock Origin is the most prominent.
How it unfolded
- Aug 10, 2026Microsoft announces a timeline to phase out MV2 extensions in Edge, which will end support for uBlock Origin by the end of 2026.
- Aug 11, 2026Mozilla posts on social media: 'Our support for uBlock Origin isn't going anywhere', reaffirming Firefox's commitment.
- Aug 12, 2026Mozilla clarifies that Firefox will keep supporting uBlock Origin, citing its continued support for webRequestBlocking in MV3.
- Aug 13, 2026PCWorld reports that Firefox is now the last major browser supporting uBlock Origin, as Safari and DuckDuckGo do not support it.
Who’s saying what
- Mozilla
- Firefox support for uBlock Origin is not going anywhere, and we continue to support the webRequestBlocking capability.
- Microsoft
- Edge is transitioning to MV3, and 95% of top MV2 extensions have already moved; only 58 MV2 extensions remain.
- Public
- A user on Bluesky said, 'This is officially Firefox's killer app. I will never go back to Chrome so long as uBlock Origin is supported on Firefox.'
Still unverified
Mozilla's timeline for adblock support on iOS is not confirmed; they said they are actively working on it but no hard date.