@Fabrico's comment on 'AdGuard publishes the world's first ad blocker built on Manifest V3'

https://adguard.com/en/blog/adguard-mv3.html

tldr: As expected V3 ad blocking will be worse than V2 (e.g. uBlock Origin) with devs having to deal with work arounds and deal with a limited number of rules.

The last phase of the launch will come very soon: starting in January 2023, all extensions on Manifest V2 will stop working, even those that were added to Chrome Web Store earlier.

For static rules, Chrome set a minimum guaranteed limit of 30,000 rules per extension and a total limit of 330,000 rules for all extensions installed by a single user (this also takes into account the limit of 1,000 regexp rules per extension). The trick is that one extension may get all of the allowed amount of rules, or there may be more than one, and then perhaps some of the extensions will fall short of the limit.

Conclusion

Despite the limitations of Manifest V3, AdGuard MV3 still protects against ads and tracking quite well:

Blocks requests to trackers proactively

Hides banners, social widgets and other annoying elements

Blocks adverts on video sharing platforms, including YouTube

Although the experimental extension is not as effective as its predecessor, most users won't feel the difference. The only thing you might notice is ad flickering due to the lag in the application of cosmetic rules.

Our goal with this prototype is to test the new approach and get your feedback. So please, try it out and let us know what can be improved. As usual, this prototype is open source and published on Github. If you have any issue with it or have any suggestion, please post it to Github and we will listen.

By releasing an extension built with Manifest V3 today — first among developers of ad blockers – we can say that we've met the challenge that Google posed to us. There is still a lot of work to be done, but we can already claim that even after the discontinuation of Manifest V2, Google Chrome users will be able to protect themselves from ads and trackers with the AdGuard Browser Extension.

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