Could not initialize the applications security component
From MozillaZine Knowledge Base
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.