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Closed tabs before closing Firefox come back when the session is restored

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  • 1 has this problem
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  • Last reply by elist

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I'm using Firefox ESR version and recently migrated from old ESR to 60 series ESR. (60.3.0esr, 64bit version) Since then, tabs closed before closing Firefox keep coming back when I restart Firefox and the previous session is restored. I'm using Firefox's standard "Restore previous session" function.

Only way to eliminate these zombie tabs is to restart Firefox in Safe Mode, close those tabs and restart in regular mode again. However, manually disabling all add-ons didn't changed the situation. Also, I already tried to rebuild my profile, but didn't work as well.

I found out that this only but always happens when I close any "about:*" or "moz-extension" tab. When I close any of those configuration-tab, that configuration-tab and other regular tabs already opened at that moment come back even I close them before restarting Firefox. Tabs newly opened "after" I open those configuration-tab won't meet this symptom.

Example: Start with Tab A, Tab B

-> Open new Tab "about:preferences" and then Open new Tab C

Tab A, Tab B, Tab "about:preferences", Tab C

-> Close Tab "about:preferences" first, then Close Tab B and C

Tab A

-> Restart Firefox and restore previous session

Tab A, Tab B, Tab "about:preferences" (Tab B and Tab "about:preferences" irregularly come back, but not Tab C since it's opened after opening "about:preferences" Tab)

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I forgot to mention that I'm using Japanese version of Firefox ESR. But my profile path does not include any non-ascii characters. (and my apology, somehow part of my explanations is considered as pre-formatted text...)