Is secureblue really more secure if browsers have to be installed in flatpaks?

Ad blockers basically rely on blocking a tonne of domains, manifest V3 severely limits the number of domains that can be blocked, so while ublock is still good the manifest V3 version is much worse than the manifest V2 version as it can’t block nearly so many ads/trackers. Firefox blockers don’t have this issue and because brave’s ad blocker is built in it doesn’t have it either.