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I didn't finish the 8.01 upgrade, but firefox turned off some add-ons anyway. How do I know if I'm running 8.01?

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I chose the apps/add-ons I wanted to keep, clicked next, and when I found out Norton security wouldn't work, I clicked the X (close button), thinking the update would NOT finish. But now I've lost my centurylink add-on, and I suspect my norton security. How do I get the pre-update version back?

I chose the apps/add-ons I wanted to keep, clicked next, and when I found out Norton security wouldn't work, I clicked the X (close button), thinking the update would NOT finish. But now I've lost my centurylink add-on, and I suspect my norton security. How do I get the pre-update version back?

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