Firefox has stopped accepting many security certificates, including one to check it's own addons from Mozilla corporation. I know these websites are perfectly safe and have frequented them before. I've tried reinstalling firefox to no avail. Any ideas?

Running windows 7 64 bit home
Running virus scan as we speak

I don't know if this has been answered elsewhere, and am not completely sure this is the correct answer. I was having this problem after upgrading to Firefox 3.6.8. Happened in Thunderbird as well.
On Firefox, go to Edit->Preferences->Encryption. Under certificates (specifically, under "when my server requests my personal certificates"), option "Ask me every time" is on by default. Choose "Select one automatically".
Hope this works for you.

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