

Notes worth making:
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Mv2 will not be deprecated in firefox or firefox based browsers
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Adblock plus is not the best adblocker extension, even for Mv3. uBlock has made a version that works with Mv3, called uBlock Lite
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Even though Mv3 adblockers exist, they will always be worse than Mv2 adblockers, because they have a limited set of rules.
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.