Baffling seeing the "well, [chromium based browser] has adblock in [X Y Z] form." Use the browser that will actually prevent this from disaster from happening again, which is Firefox.
What about FOSS software is inherently jank? This is a stupid take that's likely informed by some bad past experiences, of which I've had many with proprietary crapware.
It is easier to find crap FOSS software because it is easier to make & maintain a FOSN project when you're less competent & you don't have a strategy for long term success. Proprietary software relies on for-profit motives to improve, while FOSS software relies on user feedback & community incentives. This is why, while the average quality of service from FOSS programs is potentially worse, the best QoS is usually from a FOSS program. See Elk for Mastodon for a fantastic example of premium quality.
Have you tried Molly FOSS, or are you using the standard one with proprietary dependencies? Is there a meaningful difference in day to day functionality?
Now, if only they would quit expanding coal mines to burn the dirtiest, nastiest possible coal.