hello, opera has the tabs located above the address bar,
how to i customize the browser to move the tabs to the bottom (directly above the taskbar?

currently running windows 7.
the screenshot is a very old version of firefox using a script in userchrome.

previously firefox had an addon called "Tab Mix Plus" which allowed extensive customization including moving the tabs to the bottom, but stopped working when firefox updated a few years ago.

the latest version of firefox will break my script

additionally, firefox has stopped supporting windows 7