Programs hijacking my Firefox add-ons page

I recently updated Flash etc. when asked, but i also installed a Firefox add-on called YouTube Unblocker, which is supposed to (and does!) do what it says.
Now a few saved web pages involved with WordPress tips and my Add-ons Page are hijacked by Yahoo search results.
I've tried setting the default search engine to Google (successful) and doing the about:config change, but this takeover still happens.
I can't uninstall the YouTube thing as my Add-ons page stays for only 2 seconds! CleanMyMac can't do an uninstall as the progarm does not show up.
All ther stored web pages are unaffected.
Can anyone help?

Date and time correct.
Everything was fine until I updated to FF 4.01
See attached images.

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Programs hijacking my Firefox add-ons page

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