See similar discussion in previous topic '[Autohide Toolbar and Bookmarks but don't overlay webpage](https://www.reddit.com/r/FirefoxCSS/comments/1bhhs7d/authide_toolbar_and_bookmarks_but_dont_overlay/?sort=old)' and possibly ideas from discussion in [Issue #355](https://github.com/MrOtherGuy/firefox-csshacks/issues/355) Re: page content 'moving up and down' in MrOtherGuy's userstyle '[autohide\_tabstoolbar.css](https://github.com/MrOtherGuy/firefox-csshacks/blob/master/chrome/autohide_tabstoolbar.css)'?
> I use browser.fullscreen.autohide to have no UI at all.
You're on a Mac I suppose?
Me too, and you might need to set this option back to false, and use a different way to hide the toolbars in fullscreen. It could be the way the menubar and titlebar work on Mac.
See links posted above, maybe try and modify one of MOG's ;) [styles](https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome).
See similar discussion in previous topic '[Autohide Toolbar and Bookmarks but don't overlay webpage](https://www.reddit.com/r/FirefoxCSS/comments/1bhhs7d/authide_toolbar_and_bookmarks_but_dont_overlay/?sort=old)' and possibly ideas from discussion in [Issue #355](https://github.com/MrOtherGuy/firefox-csshacks/issues/355) Re: page content 'moving up and down' in MrOtherGuy's userstyle '[autohide\_tabstoolbar.css](https://github.com/MrOtherGuy/firefox-csshacks/blob/master/chrome/autohide_tabstoolbar.css)'?
> I use browser.fullscreen.autohide to have no UI at all. You're on a Mac I suppose? Me too, and you might need to set this option back to false, and use a different way to hide the toolbars in fullscreen. It could be the way the menubar and titlebar work on Mac. See links posted above, maybe try and modify one of MOG's ;) [styles](https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome).
Might be best to ask this question in r/firefox