Examine source code of ff7

{
  "name": "ff7",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "ff7.jpg"
    },
    "colors": {
      "frame": "rgba(255, 9, 0, 0)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(255, 255, 255, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.39)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{74574231-fc93-40e8-9398-a806c4cd0c0b}"
    }
  }
}