Usually, Firefox closes when closing the last tab on it. Now it doesn't. How do I change it back to closing when the last tab is closed?

I've checked my about:config settings beforehand since I hear the setting for this is usually in there. It's still the same and hasn't been changed. As far as I know, I haven't downloaded any add-ons recently that would cause this change. None have been installed recently. Here's a screenshot of the about:config.

Did you try Safe Mode?
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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