Could not initialize the applications security component
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For information on other messages received when accessing secure sites, see Error loading secure sites.
Hard drive capacity
Check your hard drive's remaining capacity. To do this on Windows machines:
If it reports less than 1MB free space, you'll need to make more room.
Check the file permissions in your profile folder. The file named cert8.db must not be read-only. To do this on Windows machines:
The file cert8.db in your profile folder may have become corrupted. Delete this file while the application (Firefox, SeaMonkey, etc) is closed.  To do this on Windows machines:
Non-Latin characters in username
There seems to be a bug with non-Latin (For example Chinese or Russian) characters in your username. There's no fix yet but a workaround is to make another account with a Latin characters only username.
Create a new profile. Your current profile might be corrupted due to many reasons, such as changes in your system or lack of hard drive space at one point.