Here's a useless bug report:

"Unable to spawn a new child process: Failed to spawn child process “/usr/lib/x86_64-linux-gnu/webkit2gtk-4.1/WebKitNetworkProcess” (No such file or directory)"

I do have webkit2gtk-4.1 installed, but on /usr/lib/webkit2gtk-4.1, I don't know why it was looking under that other place.