Hey Wild Willy, thank you for making those screenshots! I guess those two options don't exist on the MacOS side. :( Oh well. It would certainly be nice to have a keyboard shortcut for it. From what I was able to glean from other posts I read through, the VDH extension for the MacOS version of Google Chrome does have the keyboard shortcut options, but I'm pretty locked in to Firefox and don't really want to put Chrome on my machine.
I tried searching for an extension that enables keyboard shortcuts to be linked to various menu items in Firefox but no luck there either.
Anyway, thanks again for your help!