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After the Firefox 6.0.2 update (up from 6.0), Firefox does not open a tab/page anymore when clicking on links in e-mail(have Thunderbird 6.0.2)

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Firefox no longer receives clicks on links in e-mail and others. No response at all. When I click on URL links in Windows, I receive "Windows cannot find http://<an address>. Make sure you typed the name correctly ...". When I click on e-mail links in Thunderbird, I do not get an error but nothing happens.

Firefox no longer receives clicks on links in e-mail and others. No response at all. When I click on URL links in Windows, I receive "Windows cannot find http://<an address>. Make sure you typed the name correctly ...". When I click on e-mail links in Thunderbird, I do not get an error but nothing happens.

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A temporary fix is to run Thunderbird as administrator. Then the links work.

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This problem disappeared after a few days by itself but the last significant change in my PC prior to noticing normal Firefox link behaviour was MS Vista update KB2607712 & restart. This may or may not be the solution to the problem.