As you know, the built-in order is:

• Title (optional)
• Menu bar (optional)
• Tabs
• Main toolbar including the address bar and other buttons
• Bookmarks toolbar (optional)

Are you trying to move the address bar out of the main toolbar into a higher bar, or move the tabs to a lower position, or... what exactly?

All of that would involve a userChrome.css file, so if you don't get quick help here due to other emergencies, the community over at the following subreddit could help: https://www.reddit.com/r/FirefoxCSS/

See also this forum response for CSS code for Firefox 89+ to move the tabs to below the Navigation Toolbar:

• https://support.mozilla.org/en-US/kb/forum-response-tabs-below-url-bar

i am trying to move the tabs lower.

I don't have a userChrome.css file which I can create but honestly I have no idea what to put into it.