Product Firefox Release Channel release Version 49.0.2 Build ID 20161019084923 OS Windows 7 OS Version 6.1.7601 Service Pack 1

Is there a reason you are using an old version?

https://support.mozilla.org/en-US/kb/update-firefox-latest-version 50.1

Signature: chtbrkg.dll@0x1c3e1

chtbrkg.dll = Internet Download Manager integration = Adware

You may have ad / mal-ware. Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

hi, thanks for providing a crash id. unfortunately these crashes are probably triggered by malware that's present on your system and hooking into firefox (a lsp monitoring your network traffic labelled "chtbrkg.dll").

please go to the windows control panel / programs and remove all toolbars or potentially unwanted software from there (especially anything dubbed "adskip" or other programs you haven't installed intentionally). then please also try running security scans with various other tools like the free version of malwarebytes, adwcleaner & eset online one-time scanner.

finally you may also refer to this blog entry on how to proceed with malicious lsp-modules: https://blog.malwarebytes.com/cybercrime/2014/10/changes-in-the-lsp-stack/

@fredmcd - please follow along in the bug report, it was explicitly determined there, that idm is not related to this crash.