Firefox has been a little lagging lately. It takes some time for Firefox to start up. Is there any fix for this? Are the addons the culprit?
download & run CCleaner.
how many addons do you have? if you have a lot, then disable some of them.
You can also try out the advice mentioned in two of our past posts -
The Complete Guide: Troubleshooting Mozilla Firefox Problems
Give Firefox an Adrenalin Shot with Preloader
Let us know which solution solved your problem.
your problem could well be in too many extensions loading at once. Try to disable as many as you can and see whether it improves the slow startup.
Apparently, deleting your temporary internet files and history (C:Documents and Settings"your user name"Local Settings) or your recent documents and temp files (C:Documents and Settings"your user name"), will also speed up Firefox.
Here are more tips to speeding up Firefox, although they don't specifically target the startup: http://www.makeuseof.com/tag/the-ultimate-guide-to-speeding-up-firefox-3-5/