Hi Guys, We started testing this issue with both AVAST and AVG on both Windows 7 x86 & x64 bits but we were unable to reproduce it, The latest version of AVAST is the same version reported in the description v19.6.2383 and both AVG and AVAST has the "aswhook.dll" in the build and yet we couldn't crash Firefox.
We updated from an older version to the latest Release Fx 68.0.1, then we tested Sync, Dirty profiles, New profiles, Safe Mode and Firefox Starts without issue, We also installed some of the more common Addons but we couldn't find any issues with the AV's. The only thing to mention is that the Launcher Process for AVG shows enabled while for AVAST it shows disabled due to failure (not sure its related to the crash).
We did try different AV's settings like Hardened mode for AVAST and a few more strict options but still no luck, there are no crashes on start-up. Maybe if we knew how the mentioned dll gets invoked by Firefox, maybe some websites ? Or something else then we might be able to reproduce it on our side.