Examine source code of Flandre Scarlet

{
  "name": "Flandre Scarlet",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "flan_firefox.png"
    },
    "colors": {
      "frame": "rgba(150, 33, 33, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(112, 32, 20, 0.42)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(145, 43, 39, 0.9)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(242, 116, 116, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{381bfda9-67af-421e-b553-01fec9b3e231}"
    }
  }
}