Firefox isn't forcing Manifest V3, is it?
Firefox
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They are forcing MV3. They wrote a blog post about it a while back. But there keeping some of MV2
Edit: found the post. https://blog.mozilla.org/addons/2022/05/18/manifest-v3-in-firefox-recap-next-steps/
From an update from last week:
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.
Oh that’s fantastic! Thanks for the update.
I guess that kinda depends on what you mean by "upload". If you simply mean if user can point the extension to load some local file eg. via <input type="file">
then sure, that works just fine.
It sounds like the issue you mention regarding uBO Lite is not about if it can read a local file, but rather that it can't use that data to update the active filter lists - perhaps because it already has too many dynamically inserted filter rules, but that's just a guess.