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Originally Posted by RawAlex
When you upgrade firefox, it is HIGHLY recommended that you disable your plugins first. It isn't in their tech stuff, but it does help.
It sounds like in both cases you either have conflicts with plugins or a corrupted installation. I would recommend removing (add/remove programs) firefox and re-installing it from scratch with the new version.
You should export or save your bookmarks and stuff before removing the program 
Alex |
thank´s Alex. On my site it was a problem related to DSL connection / firewall and the router I´m using. There is a fix for it in the firefox forum:
http://forums.mozillazine.org/viewto...cd2619fd84720c
I´ve set an advanced rule for the firewall and set the MTU in the registry manually to 1492 (default is 1500 in XP). Now the connection works fine again.