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When I click a mailto link in Firefox, it no longer opens a window for me to write and send the email in Thunderbird (which is my default email app and is open all the time).

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Not sure. Possibly since I got a new laptop with Win 7 or maybe since my last Firefox update. I usually have a very current version of Firefox and Thunderbird. My laptop is 64 bit.

Not sure. Possibly since I got a new laptop with Win 7 or maybe since my last Firefox update. I usually have a very current version of Firefox and Thunderbird. My laptop is 64 bit.

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Check the value under Tools -> Options -> Applications, filtering for mailto, and make sure it is set to Thunderbird.