Why can I not see my extensions?

I have extensions and use them every day, but when I look using tools>add-ons>extensions there is nothing there. If I click on appearance or add-ons I see something, but extensions just gives a blank screen. Oh, get add-ons simply says 'loading'.

I know my extensions are there, but why can't I see them? I used to be able to. I use XP and FireFox 17 (I think).

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