I've only been visiting the BBC since 2012 so i'm ok.
I don't need to install Firefox v2, i'm happy with this version.
I didn't ask.
I've been online since..a very long time, and never had any problems. maybe it's just you? Maybe you haven't got something set up correctly?
Fatuous and trolling answers are all well and good, but unless you're sealioning you're the one talking about doing something silly. You're probably running Windows, too?...
I didn't say I had any problems - I said your plan will lead to *you* having problems. Appeal to authority (or age) is all well and good, but I'm almost as old as you and have been using and programming the web and other Unix based software for most of it. That at least lets me know that running vulnerable software in a public facing role is a terrible idea, especially something with tentacles as wide reaching and deeply embedded as a modern browser. I've been crossing the road (and driving on it) for most of my life without incident, so by your logic I'll surely never be run over or crash. So, that's good news!
Since you're so old school and educated, I assume you evaluated but for whatever discounted switching to ESR to retain the current desired feature set while still receiving security patches? Firefox v90 patched ~10 exploitable CEVs and the
exploit version history shows similar time after time.
Chrome(ium) browsers don't fare any better. How long before your browser is just a piece of Swiss cheese between you and your bank (read: money)? *shrug*
All that risk over a UI? Just tweak the code and make it how you like (after all those years of experience online you've surely picked up some skills by now), or switch to another browser. It's just not worth it.