Searchbar no longer working

Hi. Whenever I click a button on the keyboard, the CTRL+F function comes up on it's own. I had previously disabled it because it ruins all shortcuts on youtube and with tourettes, I often also get thrown around if I am reading long articles, because of misclicks. Unfortunately I did the big mistake of updating, also with a tourettes-missclick, so my question is: 1) How do I remove the 'quick'-search function? I want the Ctrl+F bar to come up ONLY WHEN I CLICK ctrl+F, and I want it to go away again if I click ctrl+F again. I forget how to do it. 2) How do I remove all future update prompts? Given that it has been made so hard to configure firefox into something tolerable, I don't want to throw all my setup away with minor updates always thrown at me. It takes me a long time every time there's an update, I have to fix language and other stuff back again. It's just not worth it in time for me to use Firefox, if I have to make a setup so often. 3) Recommendations for the best version of Firefox to go back to and stay in for eternity, alternatively, browsers that does not change or add functions without first asking the user... (The answer is no, by the way, I don't want more new fancy functions) Sorry for this nagging but I simply can't use my browser like this. It's just not working.