I can confirm this.
I have the same error in ~/.xsession.errors then, if it fails. It fails
sometimes/sporadically, but works afterwards then.
I've experienced since a while already.
Maybe this is related to some extension? - I have quite a lot, and remember
that Firefox sometimes had been
** Changed in: firefox (Ubuntu)
Assignee: (unassigned) = Mozilla Bugs
Status: Unconfirmed = Needs Info
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Firefox crash when run from Run Command box
https://bugs.launchpad.net/bugs/97492
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Bugs, which is the bug