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I used this code which places the tab above the vertical bookmarks bar, but in this new Firefox-beta v.123 the code stop working, I tried a bigger number and don't work, I tried to put a lower index to the bookmark-bar and a bigger number to the selected tab and didn't work. I need a beautiful help. my theme is this Firefox-gx
I'm not quite sure what the issue might be, chances are this fedia thing isn't showing me any code or screenshots you might have added to your post.
Just a very wild guess, could it be the nav-bar shadow, which could previously be removed with something like that:
Maybe check if there is a that shadow listed in the browser tools, and if so how it is applied in FX123; also if the issue occurs with every theme, or just the ones that are not native Fx or system themes.
Link to the screenshot : https://fedia.io/media/f8/c7/f8c7076071c3f3dc7658167248963c658ebcc19ce69d45ed752f79918ed41ddb.png