Specifically:
- YouTube ad blocking will not work. At all, most likely. The filter lists/scriptlets would have be updated more often than Google would be willing to process extension updates (because filter lists can no longer be updated separately from the extension)
- Some sites will show blank space where ads used to be.
- If a website bypasses adblocking, it will take (a week?) longer than it normally does for those updates to propagate, because those updates have to go through Google’s review first.
- It’ll be hard to update the extension to tackle more advanced ad blocking technologies, because the blocking engine is hardcoded into the browser in MV3
