Quote:While Google is ending support for classic extensions for more users of its Chrome web browser, several browser makers have pledged continued support for Manifest V2 extensions.

Mozilla confirmed in 2023 that the organization's Firefox web browser would support classic extensions and new extensions at the same time. It was not the only browser maker to pledge support. Brave Software and Opera Software also came forth and said that they would support at least some classic extensions.

Mozilla reaffirmed its stance on future extensions support in Firefox this week on the organization's official blog.

In short: Firefox will support Manifest V2 and V3 extensions at the same time going forward. Mozilla says that the decision will give developers more flexibility and "creative possibilities".

This also ensures that Manifest V3 extensions are compatible with the open source browser and that users can continue using their classic extensions. In other words, it is giving users access to the best of both worlds and developers the freedom to stick to Manifest V2 for their extensions or to use the newer Manifest V3 ruleset for extensions instead.

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