We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.

1. On the keyboard, press [Windows] The image "Windows key" does not exist. + [R]. This should bring up a Run window that contains a text field.
2. In that text field, type %APPDATA% and press Enter. An explorer window should open.
3. From that explorer window, double-click on the Mozilla folder, then double-click on Firefox and then on Crash reports. Double-click on submitted.
4. Now, you should see a list of files that contain reports. Go to View > Arrange Icons by > Modified to get the most recent files at the top of the window.
5. Open the most recent 5 files with a text editor and copy the IDs.
6. Paste each ID with bp- into the reply window on the forums.

Thanks in advance!

You can find more information and troubleshooting steps in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

Crash ID: bp-306cffdd-0ccf-4aab-8240-1811e2151012 Crash ID: bp-5077aee2-d95b-4979-9f39-02ff52151012 Crash ID: bp-c503e08e-8775-49ad-8932-603fc2151008 Crash ID: bp-a75c8e3a-710d-4c8a-8009-9efcc2151008 Crash ID: bp-8612cad3-12a9-40f7-808d-e23862151001

thanks. so unfortunately this crash is caused by websense endpoint security software that is running on the device - websense has released an updated version (8.1.2224) which should address the issue. in case your computer is part of a managed enterprise environment, please get in contact with your it department about this issue. more information is available in bug 1181091.