I have tried all suggestions in articles relating to 'links in Thunderbird not opening in Firefox.' None of them work. The Thunderbird community said it was a problem with a setting in Firefox, that is, how Firefox handles Thunderbird. The issue is, one link will usually open if it is the first time I click a link in Thunderbird. After that I cannot open any links to Firefox, and each click on a link in Thunderbird (including the first one) produces an additional firefox.exe in Task Manager (see image). Each of these Firefox iterations are generally 49,000+K. They do not seem to interfere with Firefox's operation. I also cannot right click to 'open link in browser.' Only copying link location and pasting it into the browser is working for me. this has been fairly recent with the last two upgrades to Thunderbird and the recent upgrades in Firefox. I am running Win 7 Pro. Any suggestions?