


2024: “Firefox, however, has no plans to deprecate MV2 and will continue to support MV2 extensions for the foreseeable future. And even if we re-evaluate this decision at some point down the road, we anticipate providing a notice of at least 12 months for developers to adjust accordingly and not feel rushed.” https://blog.mozilla.org/addons/2024/03/13/manifest-v3-manifest-v2-march-2024-update/
2025 : “While some browsers are phasing out Manifest V2 entirely, Firefox is keeping it alongside Manifest V3. More tools for developers means more choice and innovation for users. […] Firefox, however, will continue supporting both blockingWebRequest and declarativeNetRequest — giving developers more flexibility and keeping powerful privacy tools available to users. We’ll keep you updated on what’s next for extensions in Firefox.” https://blog.mozilla.org/en/firefox/firefox-manifest-v3-adblockers/