... I can only hope Mozilla never decides to screw over the Firefox ESR users...

*Edit (Short rant)
They dropped support for custom (unsigned) extensions a while back forcing me to look for alternatives. There's no way I could get my extension signed. It's nothing more than a backdoor into the browser's environment that runs code from a file outside of the extension and allows me to refresh changes to that code with a single mouse gesture.

I tried the developer edition of Firefox, but that had Firebug built into it in a terribly inferior state. And since it was built in, you couldn't install the extension version... So I went with Firefox ESR and that has been working just fine.

Now I hear they are abandoning support for anything but WebExtensions. I rather doubt they will do that in ESR any time soon due to the reasoning behind the ESR version. But support for some of the extensions I use will be discontinued due to this change. So maybe it's about time I start looking for another browser.