"Hey, #Mozilla!" "YOU SUCK!!!" </Slap_Shot>
#Firefox 137 broke tabs-on-bottom CSS again. Come on, Mozilla, you cannot possibly be still unaware that so many of your users want their #tabs on the #bottom where it makes rational sense. Would it LITERALLY FUCKING KILL YOU to just make it a UI config toggle?
Update: Cleaned up an older CSS patch and downloaded the latest revision, which seems to work.
For anyone else who needs a pointer:
https://github.com/MrOtherGuy/firefox-csshacks/blob/master/chrome/tabs_on_bottom_v2.css
There's instructions on that repo for using it. Make sure you clear out any old CSS patches.