Why aren't my add-ons enabling?

I recently updated Firefox while my add-ons were disabled. Normally this would fall under the "Re-enable add-ons" thread you guys already have, but I'm not getting an error message about the add-ons. I just tried to re-enable them about five times (along with a couple days ago), and while I can get it to say "these will be enabled when you restart Firefox", restarting it doesn't enable them. They just go back to being disabled. The ones I want to enable are NoScript and DownloadHelper.

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