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In my younger days I used Firefox as me default browser on Windows. It was fun to tinker with. The add-ons were especially interesting. Things like greasemonkey let you lay over a custom script over the websites you visited. But when I started to concern myself about the security of all this tinkering, I stopped with running script that a very sympathetic Russian kid had created. So at that time I switched to Google Chrome and now I'm using Edge Chromium.
So you made bad decisions, but Firefox was the problem? Alright.
Oh, luckily I've never experienced problems. I just wanted to point out that the appeal of Firefox for me was the appeal of being able to tinker with it and create my own custom experience. But not being able to, with confidence, verify the safety of plug-ins that I used or things that I tried out, I just stopped doing these things. And because I stopped tinkering with the browser, I used Firefox less and less. I had the same feeling with using custom ROMs for Android phones. So definitely not anything wrong with Firefox. It's not Firefox that changed, I changed.