I'm using LXLE 12.04.4 (previous) with Thunderbird and Firefox.  Firefox is set up with google.com as home page and Firefox is the default browser.  Any time I click on a link within any message in Thunderbird, whether or not Firefox is open at the time, the LXLE.net/support page opens in Firefox, but not the page addressed by the link.  I've tried uninstalling and reinstalling Firefox and opening Firefox in safe mode.  Any suggestions?