No, it isn't. They killed adblock, and have a business model of throttling other browsers to force people to Chrome (Youtube throttling) and doing digital fingerprinting with exclusive-only Chrome finger prints as seen here on HN the other day.
Firefox has anonym, where it sells your 'anonymous data'
https://lifehacker.com/tech/why-you-should-disable-firefox-p...
I just looked, go to Settings -> type advert and you'll see
Website Advertising Preferences Allow websites to perform privacy-preserving ad measurement This helps sites understand how their ads perform without collecting data about you. Learn more
It comes pre-checked for you.
I use Chromium for dev stuff, but now; there's no ublock origin.
You might've tried it during an arms race moment. YT is constantly changing it's anti-blocking measures, and uBO and uBO Lite are constantly responding. uBO had the same issue.
uBO Lite does lack custom filters and custom filter lists. It also doesn't have sync, but uBO didn't do sync well anyway. Also sync is far less useful without custom filters.
https://news.ycombinator.com/item?id=41871873
https://news.ycombinator.com/item?id=43240477
Besides, using that together with a DNS blocker does a wonderful job, whether you believe it or not.
One of the reasons I've moved to Chrome is because of the memory problems with Mozilla that I've been experiencing for years. Every so often I look up other people who've been having the same issues. They seem to have been reported for years, but there's often a surprising amount of hostility from Firefox fans whenever they get mentioned.
As an aside, both Firefox and Chrome made their browsers significantly worse when they changed the order of windows in the windows menu from chronological to alphabetical.
You might want to check it out.
Features and bugfixes are important, but they're table stakes for an everyday browser. They aren't enough to sell it.