Examine source code of blackgray tech

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "blackgray tech",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(14, 15, 15, 0)",
      "toolbar_text": "rgb(200, 195, 195)",
      "frame": "rgb(4, 4, 4)",
      "tab_background_text": "rgb(211, 203, 206)",
      "toolbar_field": "rgb(8, 8, 8)",
      "toolbar_field_text": "rgb(209, 209, 214)",
      "tab_line": "rgb(146, 27, 27)",
      "popup": "rgba(47, 45, 45, 0.96)",
      "popup_text": "rgb(221, 221, 225)",
      "button_background_active": "rgba(157, 14, 14, 0.57)",
      "button_background_hover": "rgba(83, 81, 81, 0.66)",
      "icons": "rgb(193, 190, 190)",
      "ntp_background": "rgba(38, 37, 37, 0.99)",
      "popup_border": "rgba(63, 61, 61, 0.99)",
      "popup_highlight": "rgba(79, 13, 13, 0.99)",
      "sidebar_border": "rgba(115, 111, 111, 0.77)",
      "sidebar_text": "rgb(229, 224, 224)",
      "sidebar": "rgb(43, 42, 43)",
      "tab_selected": "rgba(245, 238, 245, 0.13)",
      "tab_text": "rgb(203, 26, 30)",
      "toolbar_bottom_separator": "rgba(154, 16, 27, 0.99)",
      "toolbar_field_border_focus": "rgba(131, 127, 127, 0.99)",
      "toolbar_field_border": "rgba(141, 145, 145, 0.73)",
      "toolbar_field_focus": "rgba(15, 15, 15, 0.73)",
      "toolbar_top_separator": "rgba(20, 0, 252, 0)",
      "tab_loading": "rgb(146, 27, 27)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{61dce8b5-0cdc-4c5a-8e3f-73afa10db440}"
    }
  }
}