Involuntary tab closures
When closing multiple tabs (>2), I receive the "You are about to close x Tabs" warning, which is fine. The problem is that following that warning, an extra, unintended tab closure occurs. i.e. If I close 2 tabs, I get the warning prompt, followed by a 3rd involuntary tab closure.
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OpenH264 Video Codec by Cisco Widevine by Google
- User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:72.0) Gecko/20100101 Firefox/72.0
Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.
- switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
- do NOT click the "Refresh Firefox" button on the Safe Mode start window