Examine source code of Heist space

{
  "theme": {
    "images": {
      "theme_frame": "heist1a.png"
    },
    "colors": {
      "frame": "#000563",
      "tab_background_text": "#5ca5c9"
    }
  },
  "version": "2.0",
  "name": "Heist space",
  "manifest_version": 2,
  "description": "Scene from the comic book HEIST from Bankshot Comics. (You may only use this artwork, for Firefox personas. All material remains copyright its creators.)"
}