there are a grand total of less than 10 good browser add ons. Anything else is not only unnecessary but also introduces unnecessary risk.
I'm one of those types that don't use any add ons. Just the bare bones browser. Just two actually, the Tor browser (which is based on Firefox) and plain Firefox. I even go into the settings and disable a bunch of different things, don't save any history, don't save anything, and rearrange the icons to somewhat resemble some classic look.
I got Firefox Focus on my android devices. Kinda a hassle since it doesn't remember anything after closing it, but good for taking a quick look at different sites or just finding out the answers to a couple of simple questions.
And yeah, default search engine is the duck, I delete everything else.
whereas the vast majority of online bitcoin payments are made through copying and pasting an address. It would be much easier to change the later than the former.
A lot go through so called bitcoin payment processors (bitpay / btcpay / clones), but that's still correct, you have to copy and paste to those addresses.