Sorry, there is a hidden bug related to this crash signature and the public information is scant (as far as I can see from the Bugzilla tab of the crash report linked in your question):

Updated • 4 hours ago
status-firefox62: affected → fixed
status-firefox63: affected → fixed
status-firefox64: affected → unaffected
status-firefox-esr60: affected → fixed

Your crash may have a different origin. Can you provide any other crash report IDs that might shed additional light?

jscher2000 said

Sorry, there is a hidden bug related to this crash signature and the public information is scant (as far as I can see from the Bugzilla tab of the crash report linked in your question):

Updated • 4 hours ago
status-firefox62: affected → fixed
status-firefox63: affected → fixed
status-firefox64: affected → unaffected
status-firefox-esr60: affected → fixed

Your crash may have a different origin. Can you provide any other crash report IDs that might shed additional light?

Crash ID: bp-1e1ad60e-37c1-45e9-bfab-9dc7b0180921

Crash ID: bp-b556e058-0846-4fac-a205-a66950180918

Crash ID: bp-4f4446d9-75cf-41c1-955a-18c510180915

Crash ID: bp-e396a7fa-8863-450c-9f66-f3d930180915

Those are all the reports I have in a span of 6 days, I was sure I had more but only these are in the submitted folder.

this crash is caused by downgrading with a profile that has been touched by nightly. there should be a firefox 62.0.2 update addressing that crash very soon (within a couple of hours).

I misread your original question before; all of those reports are for Firefox 62 and not Nightly. There is an update for Firefox 62 due out shortly that hopefully will help.

Thank you for your answers jscher2000 & philipp, will check after returning from job.

Renamed folder "mozilla firefox " to "oldmozillafirefox" in c:program files,

installed FF, option for re-install shows, FF reinstall and done, FF working again.

Thank you.