Thank you for singing the praises of bookmark keywords, which are apparently a long-lost and forgotten feature to many people. I love all of mine, and it sounds like you've created a great library of your own. Good thing neither of us have to agree on what keywords to use.
I have a heavily customized userChrome.css - none of Firefox's Chrome UI is exposed to me. The only UI I see are the few context menu options I left and tab groups (if you can consider that FF UI)
It's a lot like Pressing F11 without the issues that arise when using Full Screen browsing.
http://www-archive.mozilla.org/docs/end-user/keywords.html