This is a sort of solution I found this code worked for me to get tabs back to the bottom.
There is some issues with this code though where it removes the NEW TAB button Sort of solution below) and there is sort of a weird overlay that sort of blocks the Minimize, maximize and close buttons they still work but due to the over lay they have maybe 1/4 hidden but they are usable. I posted the code here that I got from a video that's like3 years old but worked.
As for the new tab solution what I did was this. If you right click on browser head area and select customize there you can see the NEW TAB button is in fact still there just somehow hidden when in normal view. So what I did as drag this button to the line above (in my case) and out it to the right side of my address bar and it works fine from there.
We do need a permanent solution though of just giving us back the option to move tabs to bottom in the settings area of FF. Not sure why they are making users go through this hassle after so many updates rather then just putting back what was once an option!!!
As I signed in today I received and email from the managemnent of this Forum.
" Happy Anniversary!
Ce-le-bra-tion! Today is your community bday! It’s been a year since you first joined our community."
So its been a year since I put my thoughts forward on this topic as I wanted the search on the menu bar and not in the Tabs Bar. which for my currrent installation is still messed up. WHEN are you"people" going to fix this? I see many comments of fixes using CSS but it gets wiped with every update you put out. I think you need to put up an electric fence for you're programmers to piss on as opposed to the user base. Would a rep from Mozzilla respond to this issue. I reference your manifesto
Principle 8
Transparent community-based processes promote participation, accountability and trust.