Firefox nonresponsive JS script at every fired up

every time i start FireFox, it will pop a warning windows like below

what happen why is it happen in the first place???

very annoying indeed :mad:

Had you installed or updated any addons/extensions around the time that it started to appear?

i just updated to 3.6 about 30 hours ago…

is it safe just to delete the nsBlokclistService.js file ??