If you don’t like flatpak there is also firejail which you can run to isolate browsers or many other programmes.
There is also a programme to run your browser from ram and commit changes to disk when it closes, which I’ve used for a year or so and can recommend. I have to look up the name later at home, if you are interested.
Browsers write to disk every couple odd seconds per default settings (I think up to 20gb a day), which eats away on an ssds life cycle. in Firefox this can be changed, but the in ram option makes it smappier as well as a benefit.
Dawn sounds very interesting. It seems to need 802.11k and 802.11v on all AP-nodes, I am not sure they are supported by my hardware though. I’ve never heard of those standards, so it seems unlikely.
I also just read about a user complaining about crashes related to dawn. Does it run stable and does it also switch to the 5ghz band or does it seem to prefer 2,4ghz, as another user noted three years ago.