Examine source code of flosweb

{
  "name": "flosweb",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "firefox-blue.png"
    },
    "colors": {
      "frame": "rgba(11, 59, 87, 1)",
      "tab_background_text": "rgba(255, 255, 255, 0.8)",
      "toolbar": "rgba(255, 255, 255, 0.96)",
      "bookmark_text": "rgba(15, 64, 82, 1)",
      "toolbar_field": "rgba(231, 237, 240, 1)"
    }
  }
}