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.

Here are the last 5 crash ID's :

bp-0fb4e7bf-f2ec-41fc-92f6-b085d2151028 bp-1fd789c2-57ed-4039-aca9-4bda02151028 bp-6fc686db-4248-4b37-af44-5d0472151028 bp-4876e0c1-9edc-4b83-aa23-afa952151028 bp-72699d12-10e1-418d-9903-f31fa2151028

It's strange, I have come down to the fact that it started after Dell Protected WorkSpace was fully disabled.

these kind of crashes only started to appear this week - has there been an update to Dell Protected WorkSpace?

Yeah I believe one came down yesterday (10/27/2015) V 5.0.22075 , It seems like that may be the culprit that damaged it, but disabled and with Firefox re-installed, it seems like it would be a non factor after going through those steps. You can correct me if I am wrong ...

Also note once I enabled Firefox in Dell protected Workspace, it will work in Dell protected workspace and not outside of it.

Kind of Baffling ....

I'll just completely remove it and go from there.

thank you, that's quite useful information (i've filed bug 1219242 for this). even though you had it switched off apparently, the crash reports showed that the dell libraries still hooked into the firefox process causing these crashes...

I can confirm that the update from Invincea posted in ( bug 1219242 ) has resolved the issue of Firefox crashing on the machine that this report was originally about.

Thanks again Mozilla Team / Community!