After upgrading to firefox 8, my extensions list is empty (about:addons), though the extensions are still operating.

1. Updated to firefox 8.
2. Visited about:addons.
3. When looking at the 'extensions' tab, I see a message that reads "You don't have any add-ons of this type installed."
Of course, the above statement isn't true ... I have many add-ons installed and as far as I can tell, all are working as usual. I see the same message on the appearance tab, but I can't recall if I had anything appearing in that tab previously. The plugins tab is populated as normal.
I'm using windows 7 and I upgraded from 7.01 (I believe).

I have 3 desktops on which I used Firefox. Upgrading 2 of 3 matched the experience described in the original question and for those, silkphoenix's answer is correct - a restart is required. While it all worked out in the end, I have to say, the experience was poor, and I hope it was a bug, rather than an intentional design decision. My initial run offered no hint as to what was happening. Even after restarting, I had to sort through separate tabs - 1 per installed extension - to make a keep/discard decision. And it only offered such choices for about half of my installed extensions. For the other half, I had to go back into about:addons to manually enable.
For the 3rd of 3 installations, I had a much better experience - on first run, post upgrade, I was offered a window in which I could check/uncheck the extensions I wanted to approve. End of story.
I'm still not sure why installing the same version offered such different experiences.

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[[Image:FirefoxSafeMode|width=520]] 
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------------------------------End>
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<blockquote>
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