hi, thanks but this crash id seems to be related to a crash of the silverlight plugin and may not give a good indication about current issues with firefox crashing during startup.

Please perform the following steps to try and give us a couple more crash report IDs, that might help us find out more about the cause of the crash at startup.

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.

Product Firefox Version 42.0 Build ID 20151029151421 Release Channel release OS Windows NT OS Version 5.1.2600 Service Pack 3 +++++++++++++++++++++++++++++++++++++++ Process Type plugin Silverlight Plug-In Version: 5.1.30514.0

Update Microsoft Silverlight

https://www.microsoft.com/getsilverlight/get-started/install/default.aspx Silverlight 5 (5.1.40728.0)

https://www.microsoft.com/en-us/Search/result.aspx?q=Silverlight

http://social.technet.microsoft.com/wiki/contents/articles/30387.silverlight-troubleshooting-installation.aspx