Accessibilty denied constantly by firefox and ui changes.

Greetings, I am on the spectrum with aspergers. I have issues with organization, lining up objects, etc, but I am highly intelligent and present well. I have no doubt society is aware of all the tropes that surround folks with my......difference. I have an incredibly hard dealing with change, and it sometimes wrecks my mental health. The changes are constantly throwing my health and welfare for a loop, and it is really harmful. Everytime I get firefox setup to where I am comfortable, something new gets shoved down my throat. How to stop the constant feature change diarrhea abuse is inflicting on my health? Recent example. I only use 2 search engines, and I cant deal with the rest, its a colour thing sorry. I have had my search engines set up like this for 14 years. Recently, firefox decided that I should go for another life rollercoaster, even though I didn't ask for it, and that I should permanently have things like history bookmarks tabs and actions as search engines, and they shouldn't be removable. I don't have a history, as I value my privacy. I don't have bookmarks, because I remember everything and it sucks, and I type about 350 wpm. Tabs information is within history, so I see firefox as duplication idiots in this case, and I don't do any actions, not even sure what they are and I really don't care at all. My parents are considering a lawsuit against firefox for accessibility issues like this, as 1 of my dad's best friends is an accessibility lawyer. How can i stop firefox from constantly flipping my autism world upside down? I don't want my parents to sue them because it will bring a lot of attention on me. Please help me re-normalize the internet for spectrum users.