Product Firefox Release Channel nightly Version 80.0a1 Build ID 20200704091658 (2020-07-04)

bp-f75c6a08-0caa-4a36-9752-f7f440200705 Signature: @0x1

Crash Reason EXCEPTION_ACCESS_VIOLATION_EXEC

msmpeg2vdec.dll = Microsoft DTV-DVD Video Decoder

This is for Sumo's Related Bugs
519616 RESOLVED FIXED Some crashes don't get unwound by the minidump processor usefully [@ @0x0] [@ @0x1]
+++++++++++++++++++++++++++++++++++++++++
bp-b3a3497b-c438-4cc1-a0d7-767cb0200705 Signature: js::ConstraintTypeSet::sweep

Crash Reason EXCEPTION_ACCESS_VIOLATION_READ

This is for Sumo's Related Bugs
1582214 NEW --- Crash in [@ js::TenuringTracer::traverse<T>]

128730 6RESOLVED WORKSFORME SIGSEGV @ js::ConstraintTypeSet::sweep when archiving a message in Thunderbird

1112741 NEW --- Crash in js::ConstraintTypeSet::sweep
+++++++++++++++++++++++++++++++++++++++++
Product Firefox Release Channel release Version 78.0.1 Build ID 20200630195452 (2020-06-30)

bp-e94fbc00-d54e-41ad-a164-e67ef0200705 Signature: js::GCMarker::processMarkStackTop

Crash Reason EXCEPTION_ACCESS_VIOLATION_READ

msmpeg2vdec.dll = Microsoft DTV-DVD Video Decoder

Attention Sumo's there are 13 related bug reports

If you want to reinstall Firefox, follow the instructions below.
If you just want to remove it, disregard the install instructions.

Let’s do a full clean re-install;

Note: Firefox comes in three or more folders on all computers. They are;

Maintenance: (Programs Folder) <Windows Only>
Firefox itself: (Programs Folder)
And two folders in the profile of each user on the computer for each Firefox profile for that user.

If you remove the Firefox folder, the user profiles would not be affected.

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

HI Joslugab

Could it be related to streaming video on twitch and the following bug?

https://bugzilla.mozilla.org/show_bug.cgi?id=1645802 :

Crash in [@ msmpeg2vdec.dll | EtwEventWrite] while watching streams on twitch.tv

Please let us know what you were doing when you observed the crash

Cheers! ...Roland