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.

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

Crash ID: bp-a9716ac8-1264-4db6-b0e3-b1bb02160612

Crash ID: bp-f26db10c-07ed-4071-a9c4-7efcf2160612

This is possibly a problem with "Websense Endpoint" software. Websense states that it only supports the Firefox ESR version, so you can consider to switch to that version if that is possible. You can try to disable or uninstall this software for now until there is an update that addresses this issue, so check for such an update.

You can contact Websense for support.

• bug 1181091 - Firefox 40 crashes on startup [@ @0x0 | ScopedXPCOMStartup::~ScopedXPCOMStartup() ] with Websense Endpoint

Please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html

How to Switch to Firefox ESR version? Can you give me the link to download, if it is required?

See:

• https://www.mozilla.org/en-US/firefox/organizations/all/

• https://www.mozilla.org/en-US/firefox/organizations/notes/
• https://www.mozilla.org/en-US/firefox/organizations/system-requirements/

Thanks, the issue is solved