Some more searching, and different search terms, has excavated this sitehttp://www.url-encode-decode.com/
Which Firefox understands yet immediately converts to a different URL that has one %3d in it. If Firefox understands that %3d is an = sign, why doesn't it understand all the others?
Looks like lazy programmers to me.
August 1st, 2nd, 3rd, 2014
"I am a machine. I am a weapon of war. I am a destroyer of life in the service of life, the sword and shield of my human creators." Bolo Invincibilus
, Mark XXIII, Model B (Experimental) 0075-NKE "Nike".