I feel like an idiot because I can't seem to get this working. Here is the error I'm getting in the source editor:
error

What the heck am I doing wrong here?

I still get that the grant method isn't supported with that command. I'm running Userscripts in Safari. No worries, I was able to get another one working - it's not as nice as the one you made but it's getting the job done for now.

It works great! Thanks so much