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Firefox stunts on Edge as Microsoft gears up to neuter adblockers: ‘uBlock Origin isn’t going anywhere’
Google began eliminating Manifest V2 extension support this year in favour of Manifest V3, which restricts the capabilities that robust adblockers require to function. Microsoft Edge is now adopting the same approach, gradually disabling MV2 extensions over the coming months. The transition limits users to stripped-down ad-blocking alternatives like uBlock Origin Lite rather than the full-featured version.
Mozilla Firefox has seized the opportunity to differentiate itself, announcing on social media that it will maintain full support for uBlock Origin and other capable adblockers. By emphasising its commitment to user choice and ad-blocking functionality whilst Chrome and Edge restrict these tools, Firefox is positioning itself as an alternative for users who prioritise blocking advertisements. Though other browsers exist, Firefox's messaging highlights a growing divide between Chromium-based browsers and those offering broader extension capabilities.
In short
- Google Chrome and Microsoft Edge are phasing out Manifest V2 extensions, effectively disabling full-featured adblockers like uBlock Origin on those browsers
- Firefox is capitalising on this by publicly committing to continued support for uBlock Origin, positioning itself as the consumer-friendly alternative
- The shift leaves users wanting comprehensive ad-blocking with fewer browser options
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
Browser vendors adopting Manifest V3 prioritise user security and privacy by restricting extension capabilities that could be exploited to harvest data or introduce malware. The technical framework aims to prevent malicious extensions from accessing sensitive APIs whilst still allowing ad-blocking alternatives that function within these constraints. Supporters argue this represents a necessary evolution in browser architecture to protect users from increasingly sophisticated threats, and that users retain meaningful choice through functional alternatives like uBlock Lite.
The case against
Critics contend that restricting extension capabilities primarily serves the commercial interests of advertising-dependent companies rather than legitimate security concerns, particularly as Firefox's continued support for full adblockers demonstrates the restrictions are not technically essential. They argue users should retain autonomy over their own browsing experience, including the choice to use comprehensive ad-blocking tools, and that removing this choice undermines consumer power against invasive tracking. From this perspective, Firefox's stance affirms that security and capability are not mutually exclusive, and that browser vendors should defer to user preference rather than unilaterally restricting functionality.
Explained simply
Browser extensions are small add-ons that change what a web browser can do. Ad blockers such as uBlock Origin use them to stop adverts and some forms of online tracking. Google’s Manifest V2 and V3 are different rule sets for how extensions work; V3 limits some of the tools that full-featured blockers rely on.
Google has begun phasing out support for V2 extensions in Chrome, and Microsoft plans a gradual change in Edge. Mozilla makes Firefox and says it will continue supporting uBlock Origin and similar extensions. The issue matters to people choosing a browser because its rules can affect which add-ons they can use and how much control they have over adverts and tracking.