Product Firefox Release Channel release Version 68.0.1 Build ID 20190717172542 (2019-07-17) Buildhub data OS OS X 10.15 OS Version 10.15.0 19A526h

bp-91082777-d756-413a-9426-b228a0190808 Signature: CoreGraphics@0x197084

Crash Reason EXC_BAD_ACCESS / EXC_I386_GPFLT

1570451 NEW --- [10.15] Firefox and Thunderbird crashes on start in MacOS 10.15 (Catalina) dev beta 5 19A526h

I suspect you have the same problem as https://support.mozilla.org/en-US/questions/1265998 +++++++++++++++++++ Also, See if there are updates for your graphics drivers https://support.mozilla.org/en-US/kb/upgrade-graphics-drivers-use-hardware-acceleration