Yasuyo said

After Firefox was updated to 60.1.0esr(64bit), it always crashes when any files are downloaded via browser. This issue is reproducible in several machines which have same environment; CentOS 6.10 + Firefox 60.1.0esr(64bit). This issue was not observed before the update. What can we do to resolve this issue?

This issue also happens in safe mode.

You said the problem started with Firefox 61 ESR?

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP- in front of the numbers/letters, click it to submit them.

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

Using your mouse, mark the most recent 7 - 10 crash reports, and copy them. Now go to the reply box and paste them in.

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support

Thank you for your advice. I am using Firefox 60.1.0 ESR (firefox-60.1.0-5.el6.centos.x86_64 ).

I tired to get the report by specifying the address, I got wrong URL instead. I encountered the crash when uploading image via Firefox and I did it in a different Windows machine.

ABRT shows "Process /usr/lib64/firefox/firefox was killed by signal 5 (SIGTRAP)"

Sounds like you are using a 3rd party build of Firefox that does not support some internal pages like about:crashes

Download Firefox For All languages And Systems {web link}

Our firefox was installed using yum and is updated regularly. I didn't know that it does not support about:crashes. (about:config is available). Thank you for your advice and the information.

Before I read your comments, we downgraded firefox to the previous version as a temporal solution and download/upload works fine now.