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Firefox updated last night and now when I click on an external link I get a message saying "There was a problem sending the command to the program".

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I've tried opening a link to a POP3 email account off of a messenger program as well as other site links sent to me through a messenger program. I get the same message, each time.

Also links sent to me in Thunderbird do not open in a browser window.

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Valgt løsning

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That seemed to have worked, both for external programs and email links! Thank you!

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Your firewall might be blocking the new version.

Make sure that Firefox is the default browser.