Hi rashreportloaf, I think some other users would find that useful, for example, when you right-click (Ctrl+click) the "+" button, a blank area of the tab bar, or a button on the mail toolbar, having more options in addition to Bookmarks Toolbar (and on Windows, Menu Bar) to turn on/off.

You can submit comments and suggestions for feature changes through one or more of the following links, or recently I saw someone created a Change.org petition (no idea whether that helps):

• Feedback: https://qsurvey.mozilla.com/s3/FirefoxInput/
• Discourse: https://discourse.mozilla.org/c/firefox-development
• Reddit: https://www.reddit.com/r/firefox/
• Twitter: https://twitter.com/firefox
• Facebook: https://www.facebook.com/Firefox

I don't think that would come very soon, so you may need to continue using custom CSS rules in a userChrome.css file for the near future. What do you think about a rule that squashes the bar down to a minimal height, but opens back up when you hover it with the mouse? The following is from when I briefly had a Mac to play with: https://support.mozilla.org/questions/1199921#answer-1065379

Thanks for that script I'll give it a try. I left feedback on the qsurvey link you sent me

You can possibly use the Browser Console (Command_Shift+J) to toggle a toolbar. You need to enable the command line.

• https://developer.mozilla.org/en-US/Tools/Browser_Console

Note that you can recall the last used commands with the Up/down key, so no need to re-enter. For the Tab bar this would be:

eTAB = window.document.getElementById("TabsToolbar");
aCOL = "collapsed";
eTAB.setAttribute(aCOL,eTAB.getAttribute(aCOL)=="true"?"false":"true");
eTAB.getAttribute(aCOL);

EDIT: Note that this probably won't work properly if you use code in userChrome.css to set the tabs on bottom. You would need extra code to remove the padding-bottom on the navigator-toolbox and this can only work if the padding-bottom doesn't have the !important flag.

window.document.getElementById("navigator-toolbox").style.setProperty(sPB,eTAB.getAttribute(aCOL)=="true"?"0px":"calc(0px + var(--tab-min-height)","important");

Toggle the entire navigator-toolbox:

eNTB = window.document.getElementById("navigator-toolbox");
sPTY = "visibility";
eNTB.style.setProperty(sPTY, eNTB.style.getPropertyValue(sPTY)=="collapse"?"visible":"collapse","important");
eNTB.style.getPropertyValue(sPTY);

Thank you cor-el, that's pretty convenient too. I just want to say the window looks awesome with no bars at all, screenshot attached

Oops file size error. screenshot attached now.