Submission Statement: This video displays the use of Police force when political bureaucrats are cornered on their corruption. The education industry is especially suspect in this, as administrators have been taking more and more power, while teachers are getting shafted with larger class sizes and less pay.
That list has half of what you need, limited instructions, and sent me on a wild goose chase. This way is much easier:
You need the Moon Tester Tool and this file: https://addons.mozilla.org/firefox/downloads/file/412805/reddit_enhancement_suite-4.6.1-fx.xpi
Go into the add-on screen, enter Moon Tester Tool options, then install the .xpi file.
Firefox/Pale Moon wouldn't let me download it (from here or through their store) so I did it through Chrome.
Your solution worked seamlessly for me, thanks man.
Note for others: Right click the link and "save link as" to get the RES .xpi file