Crashes when accessing many websites

[Sawn]

Binary package hint: firefox

I think this problem comes from the automatic installation of the flash plugin through firefox (not an installation by apt).
Since I installed flash, firefox has kept on crashing on websites (which contains flash I think because simple pages and many forums aren't crashing). I can't be sure because the site doesn't display at all.

I purged (with synaptic) all the flash-related packages to see if it would solve the problem, without success.

I don't know how to uninstall the automatic-installed flash plugin without purge firefox.
Here is the message from the terminal :

[sawn@barton] ~ $ firefox
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 118 error_code 8 request_code 147 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.)

Sorry for my english, I'm french. Hope it'll help and thanks for your work. :)

[Mateusz Drożdżyński (matid)]

Thanks for your bug report. Could you please try to obtain a
backtrace by following the instructions on
       http://wiki.ubuntu.com/DebuggingProgramCrash.
This will greatly aid us in tracking down your problem.

[Launchpad Janitor (janitor)]

[Expired for firefox (Ubuntu) because there has been no activity for 60 days.]