firefox keeps hiding my tabs - I have to hover to open them - how to prevent this

Hey jbr - Background: I just officially created my Firefox/Mozilla account (after using it for months). Then viewed a video which was fine at full screen and hit Esc to bring it back to normal screen. But the screen kept going to full screen without asking... I couldn't see my Tabs and now realize that I couldn't see my menu bar or icons at the bottom of the screen either. I Asked my question from support, which you replied to (thanks)... but in the meantime I looked on the internet and one suggestion was to right click the 3 horizontal bars on the menu screen, when it was visible, and choose Menu Bar, which restored tabs and stuff at top plus icons at the bottom. So, your suggestion WORKS now. I thank you for taking the time to send it.  :0) Oh, my gosh, for some reason now, my zero now has a 0 slanted line across it... totally incidental, but it makes my smiley face look silly.  :0) guess I'll have to use capital o,  :O) which is rounder and maybe a little happier looking. -Ed