Every time I use newer version I'm losing something, context or results of what I do, and earlier or later browser will try to be smarter and behave not as expe

Every time I use newer version I'm losing something, context or results of what I do, and earlier or later browser will try to be smarter and behave not as expected, ignore my configurations etc. - morover to extensions which I need not working and removed functionality (no need for most of new fancy stuff - but a bit of it I'm missing). I think I will be stuck at 68esr for a while because of XBL which I like and see useful - then I'm not sure if I can afford that effort of possibly rewriting a lot to avoid surprises and make the browser working *for me* without need to fight him.