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.

bp-5a1a4be5-db96-4943-a0f1-472751170809 bp-f9603fb4-da70-4f59-9978-8548f1170809 bp-f4aa1e6a-9670-4399-9b3d-a53fa0170809

thanks, unfortunately this crash is caused by the websense/forcepoint security software that is running on your device.

i presume that's in a corporate environment - please get in contact with your it department to make sure that websense is fully up to date, as it has the tendency to crash newly released firefox versions until they adapt accordingly.

another option would be updating to a newer firefox version, as newer builds above firefox 53.0 have a mechanism to try to lock out such external interference: https://www.mozilla.org/en-US/firefox/all/

Thank you!