Hello osmia, see cor-el's reply :

https://support.mozilla.org/questions/997353#answer-564323

thank you

• Create the chrome folder (lowercase) in the <xxxxxxxx>.default profile folder if this folder doesn't exist
• Use a plain text editor like Notepad to create a (new) userChrome.css file in this folder (the names are case sensitive)
• Paste the code in the userChrome.css file in the editor window and make sure that the userChrome.css file starts with the default @namespace line
• Make sure that you select "All files" and not "Text files" when you save the file via "Save file as" in the text editor as userChrome.css. Otherwise Windows may add a hidden .txt file extension and you end up with a not working userChrome.css.txt file

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

• http://kb.mozillazine.org/userChrome.css

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

#TabsToolbar{-moz-box-ordinal-group:10000!important}

The customization files userChrome.css (user interface) and userContent.css (websites) are located in the chrome folder in the Firefox profile folder.

• http://kb.mozillazine.org/Editing_configuration

Wow, this is beyond me. I can't even figure out the first step you listed without asking more questions and spending more time which at this point I'm frustrated enough to be unwilling to do.

Hopefully the next update will allow me to just click and drag.

osmia said : Hopefully the next update will allow me to just click and drag.

i'm not so sure about that, i think you can try cor-el's reply, you can do it, if you stuck you can ask us again.

thanks again