Sorry for the bad thread title...
I should know the answer to this but for some reason I don't.
When I upgraded to Windows 7 I lost the ability to click on a contact/email/mailto address in my browser (Firefox) and have my email program (Thunderbird) open up ready to send/write an mail. In Firefox > Options > Applications mailto is associated with Thunderbird.
Can someone walk me through or provide a link to resetting this?