browser.tabs.insertRelatedAfterCurrent
visiting about:config, then look for preference browser.tabs.insertRelatedAfterCurrent and set it to false.
http://mozillalinks.org/wp/2010/01/firefox-3-6-tips-and-tweaks
visiting about:config, then look for preference browser.tabs.insertRelatedAfterCurrent and set it to false.
http://mozillalinks.org/wp/2010/01/firefox-3-6-tips-and-tweaks