Document Firefox's new "Remote Debugging" tools

[cvan]

Firefox's WebIDE is being deprecated in favour of new Remote Debugging tools. (Read here for more details.)

This is useful for Remote Debugging with Firefox Reality for standalone headsets (e.g., Oculus Go).

From Firefox Developer Edition (tested with 66.0), open about:config and enable this:

devtools.aboutdebugging.new-enabled;false

to

devtools.aboutdebugging.new-enabled;true

Screenshots