Did your system having a software from digital guardian ? The crash is because of that. Uninstalling that will stop this crash.

No. i verified with the installed softwares. But i don't have any digital guardian software installed in my system.

The crash happens is because the incompatibility of software. The crash id shows that your firefox is crashed because of that software. See [https://bugzilla.mozilla.org/show_bug.cgi?id=1010493 Bug ] To stop this ,install [https://www.mozilla.org/en-US/firefox/organizations/all/ Firefox ESR] or get it from your system administrator . You can get more details on ,Firefox ESR version by [https://www.mozilla.org/en-US/firefox/organizations/ Firefox ESR Version] A similar question of [https://support.mozilla.org/en-US/questions/1001095 Firefox Crash] is here. Have a look .