J'ai lancé firefox en console et voilà la réponse qu'il me donne :
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The program 'Gecko' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadMatch (invalid parameter attributes)'.
(Details: serial 107 error_code 8 request_code 148 minor_code 3)
(Note to programmers: normally, X errors are reported asynchronously;
that is, you will receive the error a while after causing it.
To debug your program, run it with the --sync command line
option to change this behavior. You can then get a meaningful
backtrace from your debugger if you break on the gdk_x_error() function.)
[Edit] J'ai bien essayé de lancer firefox --sync mais aucun changement et même message d'erreur