They didn't just "switch". They had to fundamentally change how they block ads and the new version the adtech company forced upon everyone...drumroll...is less effective at blocking ads. What a coincidence!
Per uBlock:
>uBOL will be less effective at dealing with websites using anti-content blocker or minimizing website breakage because many filters can't be converted into DNR rules
With MV2, every request must be filtered with slow, JIT, garbage-collected JavaScript code. In MV3, filtering is handled by native browser code using the list provided by extensions. UserScripts could be used to modify the DOM, but that requires power users to manually enable it.
There is a limit on how large the list can be, depending on the browser.
Apples to oranges, scripts need an entire browser/Interpeter framework underneath it to even function
I'm actually more curious to hear what sites it doesn't do a good job on.
For many sites, especially news sites, I toggle javascript off. It's reasonably easy to do per site in chrome (click left of location bar and "site settings"). I don't know if there is an easy way to do this per site in firefox.
So far I've stuck with chrome for a few reasons:
- Mozilla doesn't implement desktop PWA and has cancelled the project. I use this. - Mozilla was using about twice as much memory as chrome. (I need to revisit this, Chrome seems to have gotten fatter.) - Safari is a royal pain to write your own extensions (last I checked you need to create an application and bundle the extension into it). - I like the multiple profiles in Chrome to sandbox things like my google login. There may be a firefox equivalent, however.