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Cannot close Firefox except with Task Manager, since last upgrade

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Since last upgrade, I can't close Firefox at all. I get a message about a "missing script."

I can't close at the X corner, can't close from the task bar.

The only way I can close is to open the Task Manager and shut it down.

Since last upgrade, I can't close Firefox at all. I get a message about a "missing script." I can't close at the X corner, can't close from the task bar. The only way I can close is to open the Task Manager and shut it down.

Okulungisiwe ngu attymcree

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Try running firefox in Safe Mode. My guess is that, over years of use, your profile (which contains your add-ons, history, settings, etc.) has become messy. You may need to reset your settings (you can do that from within Safe Mode) or create a new profile.