Firefox 58 doesn't start the second time: entity is not defined

[Jérémy VIGNELLES]

This is a transfer of https://bugzilla.mozilla.org/show_bug.cgi?id=1416851, reported on the wrong platform. I'm on linux mint, so ubuntu-bug didn't work, and I didn't find how to use apport correctly. Since yesterday, I updated my firefox package but without luck.

Steps to reproduce:

OS: Linux mint 18.1 cinnamon 64 bits
Installed firefox from PPA: (from my apt sources lists:)
deb http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu xenial main
deb-src http://ppa.launchpad.net/ubuntu-mozilla-daily/firefox-aurora/ubuntu xenial main

Firefox version 58.0~b3+build2-0ubuntu0.16.04.1

Steps I've done:
-Launched firefox
-Enjoyed it
-Close it
-Launch firefox again later, (after a reboot for example)
-See the awful message
-Tried -safe-mode without luck
-Downgrade to 56
-Firefox is starting again
-Upgrade again
-First run is ok, second is broken.

Actual results:

See the attached screenshot.
For non-french speakers, here is my translation:

XML analysis error : Entity is not defined
Location : chrome://browser/content/browser.xul
Line 381, Column 7

<menuitem...

Expected results:

Awesome firefox launching

I'm available if more info is needed :)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jérémy VIGNELLES (jeremyvignelles)]

Hi,
Is there any info I can provide to help this being resolved?

[yaztromo (tromo)]

I just upgraded from 57.0.3 today to 58 from the official 14.04 repos and got this bug straight away.

Downgrading back to 57.0.3 fixed it for the time being.

[Olivier Tilloy (osomon)]

Sorry for the lack of feedback Jérémy. Is this problem still affecting you with the latest version of firefox?

[Jérémy VIGNELLES (jeremyvignelles)]

It was a long time ago, and I don't remember how I solved this. I guess I somehow upgraded to a newer version or cleared my profile or switched to the stable channel or something, and I was able to access firefox since then.

I'm now using firefox 62 on ubuntu mate without any issue for now.

[Olivier Tilloy (osomon)]

Thanks Jérémy. Based on your feedback, I'm closing this bug now.