moi je peux acceder au site sans probleme
as tu tente cela comme indique plus haut
Check for bad bookmarks
If the problem is occurring on only selected web sites, you may be using bookmarks made from web pages that saved parameter information that no longer produces a viable page.
To fix bookmarks,
Firefox on Windows:
Right click the bookmark and select "Properties"
In the "Location" field, remove information from the right until the bookmark pulls up a web page that resolves cleanly (often getting rid of the alphanumeric gibberish at the end does the job)