Examine source code of Vinesauce Custom Theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#222222",
      "tab_background_text": "#66fb71"
    }
  },
  "version": "2.0",
  "name": "Vinesauce Custom Theme",
  "manifest_version": 2,
  "description": "This is a Vinesauce inspired persona theme I created to use\nfor Firefox. Feel free to use it! Love ya, Vinny!"
}