This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox crashes

more options

firefox does not start in normal as well as in safe mode .

firefox does not start in normal as well as in safe mode .

All Replies (3)

more options
more options

Try to delete <strike>the startupCache folder</strike> (that is for Firefox 4+) the file compreg.dat in the Firefox Profile Folder and the files XPC.mfl and XUL.mfl in the parent folder of the Cache folder (see the about:caches page for the location of the cache)

Profile: C:\Documents and Settings\<user>\Application Data\Mozilla\Firefox\Profiles\<profile>\
Cache: C:\Documents and Settings\<user>\Local Settings\Application Data\Mozilla\Firefox\Profiles\<profile>\

Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:

Modified by cor-el

more options

also i suggest you to upgrade your Firfox 3.6 to Firefox 7 where we fix lot of crash n freezes