Examine source code of One Two Cool!

{
  "name": "One Two Cool - From Dark To Light",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "One Two Cool! - From Dark To Light.jpg"
    },
    "colors": {
      "frame": "black",
      "tab_background_text": "#858587",
      "toolbar": "rgb(0, 25, 36, 0)",
      "tab_selected": "rgba(0, 0, 0, 1)",
      "bookmark_text": "#858587",
      "tab_text": "#FFFFFF",
      "toolbar_field": "rgba(5, 7, 12, 1)",
      "toolbar_field_text": "#858587",
      "toolbar_field_highlight": "#403F40",
      "toolbar_field_highlight_text": "#EDEDED",
      "sidebar": "#000000",
      "sidebar_text": "#858587",
      "sidebar_highlight": "#403F40",
      "sidebar_highlight_text": "#EDEDED"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "one-two-cool-from-dark-to-light@ersin"
    }
  }
}