Product Firefox Release Channel release Version 64.0 Build ID 20181206201918 OS OS X 10.14 OS Version 10.14.2 18C54

bp-622f1f4d-609e-41d8-a08b-a728e0181229 Signature: mozilla::ipc::MessageChannel::Send | BaseAllocator::malloc

MOZ_CRASH Reason (Sanitized) MOZ_RELEASE_ ASSERT(mWorkerThread == GetCurrentVirtualThread()) (not on worker thread!)

Crash Reason EXC_BAD_ACCESS / KERN_INVALID_ADDRESS

This is for Sumo's Related Bugs 1516662 RESOLVED DUPLICATE Crash in mozilla::ipc:: MessageChannel::Send | BaseAllocator::malloc

Let’s do a full clean re-install;

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86) Note: Check Both Folders

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any Mozilla or Firefox program folders. Do not remove the Mozilla Thunderbird folder if there is one.

Do Not remove any profile folders.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia