Firefox will not drop Mv2 support in the forseeable future. It is a huge burden to keep the standard for all chromium forks, but firefox and firefox forks do not need to carry that burden. In the far future, web standards and technologies might change enough for Mv2 to not be effective, but that is a long time away, and depends on how the technologies and standards evolve.
All websites which use GoogleAPIs and those of other advertizing companies, change these in the same moment when Google and the others change these APIs and this would not last so much time.
Firefox will not drop Mv2 support in the forseeable future. It is a huge burden to keep the standard for all chromium forks, but firefox and firefox forks do not need to carry that burden. In the far future, web standards and technologies might change enough for Mv2 to not be effective, but that is a long time away, and depends on how the technologies and standards evolve.
All websites which use GoogleAPIs and those of other advertizing companies, change these in the same moment when Google and the others change these APIs and this would not last so much time.