Add code to the userChrome.css file below the default @namespace line.

• http://kb.mozillazine.org/userChrome.css
• https://www.userchrome.org/how-create-userchrome-css.html
• https://www.userchrome.org/what-is-userchrome-css.html

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* only needed once */

#navigator-toolbox[inFullscreen] #PersonalToolbar {
 max-height:none!important;
 visibility:visible!important;
}

Thanks for the reply..

Maybe im doing something wrong? I created userChrome.css file and placed in the active profile folder. bookmarks bar still hidden when in auto fullscreen mode...  Hide toolbars option still checked if I uncheck, auto fullscreen mode disabled.

Hello, the first line is not complete, the parts that I highlight in "bold" are missing @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

You are also missing the !important flags that are required to override existing rules.

You need to use Copy and Paste to ensure you get the correct code.

Thanks I think I have the code installed correctly now but when I toggle F11 , it goes into fullscreen mode but bookmarks bar is still hidden and now the auto fullscreen feature mouse hover is disabled.. Im trying to keep the auto fullscreen mouse hover feature and prevent the bookmarks/favorites bar from becoming hidden when F11 is toggled on.. Thanks again

With the code I posted the Bookmarks Toolbar is included in the toolbars that show if you hover the mouse to the Bookmarks Toolbar all the time then you can only do this via the right-click context menu (remove checkmark on "Hide Toolbars").

with the code installed...enabling F11 immediately hides bookmarks bar and goes into auto fullscreen mode with hover working...removing the "hide toolbars" checkmark immediately toggles F11 off and bookmarks bar remains hidden with no way to bring it back unless you toggle F11 off then bookmarks bar comes back... Can u screenshot on your end... Im not seeing bookmarks bar when I hover

Do you have the code in userChrome.css exactly as I posted above and is the userChrome.css file located in the chrome folder in the profile folder?

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

• Help -> Troubleshooting Information -> Profile Directory:
  Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder
• http://kb.mozillazine.org/Profile_folder_-_Firefox