Several days ago I noticed that "Hide bookmarks toolbar" option is missing, I used to use this option when I right click at the top of the Firefox window. Then I tried to hide it by clicking on View -> Toolbars and then I should uncheck the Bookmarks toolbar but it's missing here too. When I click on Customize I used to see Bookmarks toolbar at the bottom of the page under Toolbars menu item, but I can't see it here too.
I tried restarting without addons and I also refreshed the Firefox, didn't help.
This question is originally posted on Firefox support so I'll paste the link in case someone needs some info: https://support.mozilla.org/en-US/questions/1209543