Tabs are not closing.
After the most recent upgrade: 1. I don't have an 'x' in the tab bar to close the tab with. 2. when I click on the top rh corner to close tab there, the tab stay open although not visible. 3. once i close firefox, i cannot reopen without restarting my computer.
Opaite Mbohovái (2)
You can close a tab with a middle click on that tab.
See "Hang at exit":
See "Firefox hangs when you quit it":
If you want to re-unable 'x' in the each tab
type in the address bar about:config
then press the button i'll be careful i promise
then type in bar browser.tabs.closeButtons (or copied from here)
then right click on it , select modify, and put 1, click OK
exit firefox and restart-it.
see for info : Browser.tabs.closeButtons
thank you
Moambuepyre