Examine source code of BrightenLight

{
  "name": "BrightenLight",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "44445.png"
    },
    "colors": {
      "frame": "rgba(228, 233, 245, 1)",
      "tab_background_text": "rgba(161, 153, 153, 1)",
      "toolbar": "rgba(192, 236, 240, 1)",
      "bookmark_text": "rgba(250, 190, 190, 1)",
      "toolbar_field": "rgba(240, 218, 218, 1)",
      "toolbar_field_text": "rgba(232, 88, 88, 1)",
      "tab_line": "rgba(232, 49, 49, 1)"
    }
  }
}