Mozilla Reaffirms That Firefox Will Continue To Support Current Content Blockers

Martin Brinkmann writes via gHacks: From next year onward, extensions for Google Chrome and most other Chromium-based browsers, will have to rely on a new extension manifest. Manifest V3 defines the boundaries in which extensions may operate. Current Chromium extensions use Manifest V2 for the most part, even though the January 2023 deadline is looming over the heads of every extension developer. Google is using its might to push Manifest v3, and most Chromium-based browsers, including Microsoft Edge, will follow.

Mozilla announced early on that it will support Manifest v3 as well, but that it would continue to support important APIs that Google limited in Manifest v3. Probably the most important of them all is the WebRequest API. Used by content blockers extensively to filter certain items, it has been replaced by a less powerful option in Manifest v3. While Manifest v3 does not mean the end for content blocking on Chrome, Edge and other Chromium-based browsers, it may limit abilities under certain circumstances. Users who install a single content blocker and no other extension that relies on the same relevant API may not notice much of a change, but those who like to add custom filter lists or use multiple extensions that rely on the API, may run into artificial limits set by Google.

Mozilla reaffirmed this week that its plan has not changed. In 'These weeks in Firefox: issue 124,' the organization confirms that it will support the WebRequst API of Manifest v2 alongside Manifest v3. Again, a reminder that Mozilla plans to continue support for the Manifest v2 blocking WebRequest API (this API powers, for example, uBlock Origin) while simultaneously supporting Manifest v3.

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