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FF Nightly as of june 9th - "XML : entité non définie" at startup

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  • Last reply by cor-el

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Ubuntu 18.04 LTS up-to-date daily. Last update FF Nightly 68 of 2019-june-9.

After a general "freeze" of VirtualBox witch crashed my Ubuntu, I restarted the PC and since I cannot start Nightly any more. I receive the message : Erreur d’analyse XML : entité non définie (NB : In english it would means +/- : "undefined entity") Emplacement : chrome://browser/content/browser.xhtml Numéro de ligne 50, Colonne 1 : <window id="main-window" </p>

I've tried using the option "-safe-mode" but it starts my FF 67 in place of Nightly 68. Without any saved tabs.

I know that I can install the latest Nightly over (or even remove) the current installation and be easily okay BUT frankly there is about 60 tabs and some "page mark" I'd like to be sure to get back before doing something extreme.

N.B.: The "Troubleshooting information" file below is FALSE as it is from my current FF and not the Nightly I cannot start anymore.

Chosen solution

Try to reinstall Firefox.


You can create a new profile to test if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

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Chosen Solution

Try to reinstall Firefox.


You can create a new profile to test if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.