This should fix the weird problems introduced in the past few 1.3.2.x versions. And yes, the update clears all your current closed tabs and resets some data. Settings should be intact though.
Sorry for any inconvenience caused.
Theres still stuff I want to try but I'll test it more thoroughly this time before putting it up.
EDIT: If the update happened with the extension disabled the reset will not run (since its disabled), please manually click the Clear button or reset via the Options page.