And when Manifest v3 is fully enforced in Chromium (current date is slated to be July 2024), then the more restricted uBlock Origin Lite would need to be used instead.
(I'm not sure if Arc will fully adopt v3, but they might not have a choice at some point in time.)
TL;DR: The way uBlock Origin works on Firefox right now is already better, but if Arc has to go along with Manifest v3 in Chromium in a few months, then it'll be even more of a differentiator.
It also looks like they're even thinking about rolling out their own tracker blocker (instead of using uBlock Origin) as a result of the Manifest v3 changes:
We're rolling our own native @arcinternet
Ad & Tracker Blocker in 2024 (since Chrome is restricting them)...
Any creative ideas for how we can go above and beyond, and reimagine the category?
Remove GDPR/Cookie Consents? What else?