Examine source code of Speed Rivals

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Speed Rivals",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 0, 145, 0.13)",
      "toolbar_text": "rgb(222, 233, 230)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(222, 233, 230)",
      "toolbar_field": "rgba(0, 0, 0, 0.61)",
      "toolbar_field_text": "rgb(64, 223, 179)",
      "tab_line": "rgb(222, 233, 230)",
      "popup": "rgba(25, 25, 33, 0.85)",
      "popup_text": "rgb(222, 233, 230)",
      "button_background_active": "rgba(255, 255, 255, 0.29)",
      "button_background_hover": "rgba(255, 255, 255, 0.29)",
      "frame_inactive": "rgba(0, 0, 0, 0.61)",
      "icons_attention": "rgba(255, 255, 255, 0.29)",
      "icons": "rgb(222, 233, 230)",
      "ntp_background": "rgb(222, 233, 230)",
      "ntp_text": "rgba(255, 255, 255, 0.29)",
      "popup_border": "rgba(57, 38, 178, 0.76)",
      "popup_highlight_text": "rgb(173, 209, 254)",
      "popup_highlight": "rgba(57, 38, 178, 0.76)",
      "sidebar_border": "rgb(31, 34, 61)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgba(57, 38, 178, 0.76)",
      "sidebar_text": "rgb(38, 108, 178)",
      "tab_loading": "rgb(222, 233, 230)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d52a48d1-179e-430d-bf0e-233de79b8e6d}"
    }
  }
}