Examine source code of Tails and Cosmo

{
  "name": "Tails and Cosmo",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "Tails and cosmo banner.png"
    },
    "colors": {
      "frame": "rgba(77, 175, 28, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(255, 186, 13, 0.69)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.21)",
      "toolbar_field_text": "rgba(0, 0, 0, 1)",
      "tab_line": "rgba(255, 255, 255, 0.69)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4973285-614d-48d1-90b3-5c832ebfaf6b}"
    }
  }
}