So this is basically the manifest v3 version for Chrome, ported to Firefox?
Yes.
What I don't know is:
1) whether their implementation of declarativeNetRequest has that arbitrary limitation
2) whether uBO Lite ships the same (limited) filters in the Firefox release.
I'm guessing 2) is true for simplicity, but that's purely a guess.
4 days ago the Chromium developers proposed upping the limit for certain types of declarativeNetRequest rules based on data AdGuard provided on real world rule lists. https://docs.google.com/document/d/1srkkCJkl4X2KOOUwnpDd-kvm...