Firefox 54 launched from Dock on Sierra crashes I'm running macOS 10.12.5 Sierra with Firefox 54.0 on a MacBook Air. A Firefox icon is present in the Dock. When launching Firefox from this icon (or double-clicking the icon in the Applications folder), it immediately crashes. However, if I launch it via the command line ($ ./firefox in the app folder), it does not crash. Launching via open -a Firefox also crashes.

I launched Firefox from the command line in safe-mode and disabled all add-ons, but it still crashes when launched from the icon in the Dock.

I'm using the new Compact Dark theme. I disabled this and tested again, but Firefox still crashes when launched from the Dock icon.

Removing the icon from the Dock and adding it back did not solve this.

Downloading a fresh copy of Firefox 54.0 and installing over the previous version of 54.0 did not solve this.

Suggestions to fix this?

Update: This is not resolved in Firefox 54.0.1.

Update: This appears to be resolved in Firefox 55.0.2 (64-bit).
Do the following in a terminal:

cd /Applications/Firefox.app/Contents/MacOS

./firefox &amp;

Firefox 54.0 will launch successfully with all installed add-ons and themes activated.