I finally made the swap from Firefox late last year after over a decade of use, the reason? I was sick to bloody death of updates destroying my settings. Every. Bloody. Update. I would need to find a custom CSS to set things to right, and that's not even getting in on the whole addon cataclysm from a few years ago that nuked many of the addons I relied on.
Finally the whole thing just died due to one of the many bugs and I needed to do a complete fresh install of it, losing every setting. I thought to myself if I needed to set up a new browser I might as well just switch to Chrome.
Yes it's not as customizable, yes it is made by Google, but it *works* and doesn't screw with me by lumping stupid UI changes in with security fixes. I don't care if the UI designer has found a 'better' setup, I don't want to change what works every two months.
I know of two people who are running years old versions of Firefox, unsecure versions, because they have things the way they want them and don't want to risk an update nuking everything.
For a browser that was built on customization the current developers are very much in the "Stop doing things WRONG! RESPECT MY VISION!"
