https://www.mozilla.org/en-US/firefox/57.0.2/releasenotes/

There are a few small fixes in 57.0.2, and a few critical security fixes, so you should update. But it won't change how Firefox looks

Thanks for the quick reply and info! I just want to make sure that the toolbar will look the same and I don't lose anything...

We try to make sure you don't ever lose anything :) Sometimes it happens (like in 57 we retired an old technology for some types of add-ons, so users of those add-ons lost them) but we try to keep that to a minimum

Thanks again.... Will the "File, Edit, View, History, Bookmarks, Tools, Help" still appear at the top? Will the icons I have below my search bar still appear, like "Ask.com"? Sorry if these questions seem foolish, but I'm still adjusting to 57.0...

I assume "Theme and Font Changer" will still not work with 67/0/2? Thanks again!

Any extensions that work in 57 will work in 57.0.2 (it's a minor change). There will be no changes to your interface.

You can read the release notes to see everything that is changing

One last silly question: is there a simple way to restore the yellow to the grey bookmark folders? Thanks!