I have some more information that may help others. In this scenario, Firefox is triggering the buffer overflow protection of our security software. Adding firefox.exe as an authorized program for buffer overflows resolves the problem.
This seems like it might be important to Mozilla, so I will submit a bug for this. ------------------------------------------ Jason Jackson Computer Systems Technician North Vancouver School District From: Enterprise [mailto:[email protected]] On Behalf Of Jason Jackson Sent: March 13, 2017 2:14 PM To: [email protected] Subject: [Mozilla Enterprise] ESR 52 PDF.js Instability In our end user testing with ESR 52, we got feedback about PDFs locking up. Sure enough, on every machine, every AcroForm is causing Firefox to stop responding. It doesn't actually crash, Firefox just becomes completely unresponsive, and you have to end task firefox.exe. I tried deleting our autoconfig, I tried "Restart with Add-ons Disabled", and I tried Private Browsing mode, but none of this helped. Reverting to ESR 45.7 does resolve the problem. Then I noticed on a personal machine that there was no problem. After some troubleshooting I've determined the cause is our security software: Sophos Endpoint Security and Control 10.6. SESC isn't blocking or logging anything when this happens. And it begs the question, why is ESR 45 okay with it but ESR 52 isn't? I'm at my wits' end. Any help is appreciated. ------------------------------------------ Jason Jackson Computer Systems Technician North Vancouver School District
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