We're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash IDs to help us learn more about your crash.

The crash report is several pages of data. We need the report numbers to see the whole report.

1. Enter about:crashes in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
2. Copy the 5 most recent Report IDs that start with bp- and then go back to your forum question and paste those IDs into the "Post a Reply" box.

Note: If a recent Report ID does not start with bp- click on it to submit the report.

(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)

More information and further troubleshooting steps can be found in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

These are the codes: bp-b7054faf-8eca-4f3a-90b2-b943e2160803 bp-a7333d6b-6594-4277-8230-1af952160803 bp-6459e992-535f-406d-b094-e55d02160803 bp-72f78833-4fbd-4847-89e2-3fe112160803 Thanks in advance

Signature: guard32.dll@0x6a919

atidxx32.dll = Advanced Micro Devices = Check this link;
http://support.amd.com/en-us/download/desktop?os=Windows+7+-+64

guard32.dll = COMODO Internet Security

msmpeg2vdec.dll = Microsoft DTV-DVD Video Decoder

This is for Sumo's Related Bugs 1274630 RESOLVED FIXED Stack buffer overrun in guard64.dll@0x494b (probably related to Comodo)

Update your COMODO

I've updated my Comodo but the window whose image I'm attaching below stil appears.

I've called for more help for you.