''locking this thread as duplicate, please continue at [https://support.mozilla.org/questions/1136731 /questions/1136731]'' I click "restore previous session" and it seems to run the script for "open new tab" instead of restoring my session. It opens up a single new tab and I can do it multiple times in the same window. The same tab opens when I try to click any link I closed in "Recently Closed Tabs" or when I attempt to drag a tab to another window. Does anybody know what could be causing this?