Very disappointing to read.   For what it's worth, uBlock-origin asserts that it "is not an "ad blocker"; [rather,] it's a wide-spectrum content blocker".

The question for me is whether this change impacts "only" Chrome itself, or whether it also applies to Chromium-based browsers.   Per the last paragraph here Google Chrome is killing one of the most popular ad blockers around (msn.com) , uBlock-Origin will still work in [Chromium-based] Edge.   I currently use uBlock-O in Edge, Firefox, and PaleMoon.

People who want/need the actual Chrome browser can consider alternative extensions, such as uBlock-Origin-LITE, which meets Google's change to Manifest V3  https://chromewebstore.google.com/detail/ublock-origin-lite/ddkjiahejlhfcafbddmgiahcphecmpfh?

You can bet if Google Chrome is going to block these types of extensions, sooner/later Edge, Firefox etc will be doing the same thing. 

I use a blocker extension with Firefox and typically get denied access to Youtube vids unless I disable the extension.  No thanks, I'd rather not be force-fed their ads and what's on YT isn't really all that important - to me...

I am certainly concerned about Edge, since, as mentioned above, it's "chromium-BASED".  We'll see what happens.   But I don't make any assumption that Firefox will necessarily implement the same policy, as it has always been independent in its development.

As for watching videos on YouTube (WITH ads) [which I find I do quite regularly], most blockers offer a "per site" exception.   So I have both uBlock-Origin and MalwareBytes Browser Guard installed in both Edge and Firefox, protecting me in general, but adding  www.youtube.com  as a "trusted site" in uBlock, and allowing ads/trackers on Youtube in Malwarebytes (while still blocking malware and scams there).   

But you have to decide/do whatever works for you.

Firefox implemented their new Website Advertising Preferences feature by default, starting in v127. (Allows websites to perform privacy-preserving ad measurement. This helps sites understand how their ads perform without collecting data about you.) 

I suspect they'll start blocking ad blockers sooner or later so they can help capture as much data as possible about ads. Blockers prevent the ads from being seen, so they reduce the amount of data available for the taking even if that Ad Preferences feature is enabled.

Thanks for the info. I spend a lot of time on YT and just click out of the ads as soon as possible. Thankfully, there are not too many or too often. Get no ads otherwise using Edge and Windows 11.

MalwareBytes Browser Guard is also impacted.... see https://www.malwarebytes.com/blog/personal/2024/08/google-manifest-v3-and-malwarebytes-browser-guard?

This is going to be a real mess, thanks to Google...