I love Firefox. The only time I have weird web page troubles is when Firefox has downloaded an update, but I haven't closed and reopened Firefox. Some pages seem broken or incomplete. It's always good again after reopening.

My Youtube feed page was showing blank rectangles instead of video thumbnails yesterday. Restarting Firefox fixed it.

I do the semi-manual firmware update setting -- it pops up a notice that it can download an update, and reminds me to close and reopen when it's done. There's probably a fully auto method, I suppose.