When Firefox loads I get an error saying 'the applications security component could not initiallize'. I have a 64-bit PC based system.
When I load Firefox I get an error message that tells me that the application security component could nt be initiallized. The suggestion from the error meddage was to see if there is a read/write restriction for the application profile directory. I have looked and found no such restriction on that directory. Firefox will load and allow me to look on the web, but many of the functions do not work. I have a 64-bit system using Windows 7 (64-bit version).
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Rename secmod.db (secmod.db.old) in the Profile Folder in case there is a problem with the file. You may have to rename cert8.db (cert8.db.old) as well. Firefox will create new files.
The file cert8.db stores user certificates and intermediate certificates send by websites, so if you have certificates that you want to keep then you may want to export them now and import them after having removed cert8.db.
See Tools > Options > Advanced > Encryption: Certificates: View Certificates
If that works then you can delete the renamed files or undo the changes if you want to revert the process.
Also make sure that you allow the loopback connection with the Software Security Device in the firewall.