Yes I get the issue with the tabs stacking bizarrely too. I find it happens most often if I try to click into firefox from another window and immediately move a tab, but it still happens while directly using firefox as well.
I'm getting a slightly different version of this issue, running firefox 143 on kubuntu 24.04 LTS. I get the frozen address bar and uncloseable tabs, but I'm also unable to re-arrange my tabs at all, and trying to do breaks the tab to the point that o...