Examine source code of Hetalia axis Trio

{
  "theme": {
    "images": {
      "theme_frame": "Hetaliaaxistriothemeforfirefoxcopy.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Hetalia axis Trio",
  "manifest_version": 2,
  "description": "Orion Nebula image credit- NASA, Hubble Space Telescope\n\nArtwork and character design of \"Italy\", \"Japan\", and \"Germany\"- Hidekaz Himaruya\n\nEditing by myself using Photoshop 7"
}