Examine source code of Alien Invasion

{
  "theme": {
    "images": {
      "theme_frame": "AlienInvasion_header_byLisa.jpg"
    },
    "colors": {
      "frame": "#3d3939",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Alien Invasion",
  "manifest_version": 2,
  "description": "background design, a collage of colorful sphere liven up your Firefox browser\n\nchild friendly persona\n\nPersonas by LisaAtTheBeach"
}