Of late, I have seen Firefox 3 taking a long time to open when my PC boots up. The subsequent boot-ups are fine. I tried a few suggestions after googling the issue on net. But here is what worked best for me... (I unchecked all these checkboxes below, and things are much better now!!!)

Hope that helps someone...
Rahul

Quote of the day:
A celebrity is a person who works hard all his life to become well known, then wears dark glasses to avoid being recognized. - Fred Allen