In the dutch forum, but after Googling distribution-wide encountered, someone reported that the newer version of Hotmail (e.g. launched from MSN or aMSN) led to problems in Firefox under Linux, e.g. Inbox still visible but shown new messages not readable and new message composing window (the editor) not available, this since Hotmail changed it's layout about a week ago or so.
After some puzzling, atolboo came up woth the definite solution to solve this issue as Pardus linux concerns.
I think it is good to spread this in the worldforum as well to prevent people from re-inventing the wheel and enable people with similar problems to solve them quicker.
This is what atolboo posted (and I translated in english):
The so-called general.useragent.vendor-settings are located in the file firefox-pardus.js
This file can only be changed with root privileges.
Open Pardus > Programs/Applications > System > More applications/programs > File Manager (in system administration modus).
Enter this in the URL location bar of Firefox:
Start with making a back-up of firefox-pardus.js e.g. to your desktop (copy here).
Open the original firefox-pardus.js in Kwrite (right mouse click-open with) and change:
then save this file.
If all geos well the problem with Firefox handling Hotmail has disappeared now.