Yes this Happened to me and I had to Refresh the Browser.

I hope you didn't have many add-ons as I did. :(

to refresh Firefox to factory settings so to say

Refresh Firefox - reset add-ons and settings | Firefox Help https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-se...

It worked for me because I am on Firefox 37

Hello kltoni08, if you have 37.0, please update to latest version (37.0.1) because the 37.0.1 version fix some crashes when firefox starts in Windows.

thank you

I am on 37.0.1 and this update is causing the problems. I will refresh and see what happens!

Any more help please? Nothing is working!

Hello, try to boot the computer in Windows Safe Mode with network support and then see if that helps.

thank you

So you are saying it is still crashing after Refresh ?

Start a New Profile

jscher2000 said

You could test using a new profile. It might be hard to go an entire day without your familiar add-ons, bookmarks, history... at least bookmarks are fairly easy to copy over.

Create a new Firefox profile

This is in addition to and does not replace your existing settings.

A new profile will have your system-installed plugins (e.g., Flash) and extensions (e.g., security suite toolbars), but no themes, other extensions, or other customizations. It also should come with completely fresh settings databases and a fresh cache folder.

Exit Firefox and start up in the Profile Manager using Start > search box (or Run) -- type or paste the following and press Enter:

firefox.exe -P

Don't delete anything here.

Any time you want to switch profiles, exit Firefox and return to this dialog.

Click the Create Profile button, assign a name like April8, and ignore the option to change the folder location. Then start Firefox in the new profile you created.

It might take a while to determine whether the new profile is works better than your old one. If you want to import your bookmarks from your regular profile during that time, here's how:

You can use the Library dialog (Ctrl+Shift+b or "Show All Bookmarks") to access the Restore feature. The trick is knowing where to find your bookmark backups in your regular profile. After clicking Choose File... you can paste this into the file name space and press Enter to drill down to your profile folders:

%APPDATA%\Mozilla\Firefox\Profiles

The semi-randomly-named folder that has your last backup is usually the one ending with "default". Click into that one, then into the bookmarkbackups folder. Here you can pick the most recently updated file to restore.

Important: restoring a bookmark backup wipes any bookmarks currently in your active Firefox profile and replaces it with the contents of the backup file.

I think it's also reasonable to install AdBlock Plus, Classic Theme Restorer, and Status4Evar, as those, by themselves, are unlikely to be the source of this seemingly rare problem. But I wouldn't add all your extensions at once to the new profile, and if a lot of system-installed extensions show up, you might want to disable the ones you do not actually use.

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP in front of the numbers, click it and select Submit.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All of them.