Why is it that every day I get at least one warning message
about unresponsive scripts? Every morning when I start up firefox I
get a warning about a script. Sometimes during the day I get more
of them, not always about firefox. I usually just click 'cancel
script' rather than waiting to see if it clears up.
If it's coming from Firefox only, try disabling all installed
Firefox add-ons and see if it helps.