Examine source code of planetgif

{
  "name": "planetgif",
  "manifest_version": 2,
  "version": "9.0",
  "theme": {
    "images": {
      "theme_frame": "ezgif.com-gif-maker(28).gif"
    },
    "colors": {
      "frame": "rgba(26, 26, 26, 1)",
      "tab_background_text": "rgba(0, 230, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 0, 208, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(255, 111, 0, 1)",
      "tab_line": "rgba(187, 255, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a63dd428-56f3-4ced-8c1b-1d3bcc046573}"
    }
  }
}