Switched to Pale Moon when Firefox when full-Google Chrome in the UI; it's like Firefox classic, compiled for 64-bit systems.
Only been slightly annoying at work, due to Cisco's WebEx not having a 64-bit plugin, a fact that I can't seem to remember before trying to join an online meeting... every. damn. time.
Oh, and annoying when Firefox Sync upgraded their back-end in ways that blocked Pale Moon from working. Installed Xmarks (hey, I use LastPass anyway, why not) and forgot all about Sync thanks to being able to sync my bookmarks properly between Firefox, Pale Moon, Chrome and Safari (IE too, if I ever used that for anything other than my company's broken internal sites).