I don't know what's going on. I had been using Green and Gray for Tumblr Dash. It still works in Waterfox, but now fails in Firefox. I kinda hate blue, though I'm not 100% sure it's contributing to my migraines.https://userstyles.org/styles/77659/green-and-grey-for-tumblr-dash
I have tried this and several other styles in Stylus and in my userChrome.css-- none are changing the dash background on Tumblr in Firefox.