This add-on could be really good, but it consummes all memory resoueces on my desktod and slows Firefox horribly. Ir can take over 10 seconds to stabilize, and then it leaves no memory available for the computer to work. I have to be constantly cleaning up the memorumemory. I'll have to remove it with greaqt regret. Also, the settings file import function does no wirk for Firafex.