Examine source code of emerald grid

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "emerald grid",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(12, 79, 65)",
      "toolbar_text": "rgb(3, 161, 126)",
      "frame": "rgb(0, 44, 35)",
      "tab_background_text": "rgb(3, 161, 126)",
      "toolbar_field": "rgb(0, 133, 104)",
      "toolbar_field_text": "rgb(0, 44, 35)",
      "tab_line": "rgb(41, 192, 159)",
      "popup": "rgb(12, 79, 65)",
      "popup_text": "rgb(41, 192, 159)",
      "button_background_hover": "rgb(0, 44, 35)",
      "icons": "rgb(3, 161, 126)",
      "ntp_background": "rgb(0, 44, 35)",
      "ntp_text": "rgb(0, 133, 104)",
      "popup_border": "rgb(63, 169, 132)",
      "popup_highlight_text": "rgb(0, 44, 35)",
      "popup_highlight": "rgb(41, 192, 159)",
      "sidebar_border": "rgb(0, 133, 104)",
      "sidebar_highlight_text": "rgb(3, 161, 126)",
      "sidebar_highlight": "rgb(0, 133, 104)",
      "sidebar_text": "rgb(41, 192, 159)",
      "sidebar": "rgb(0, 44, 35)",
      "tab_loading": "rgb(63, 169, 132)",
      "tab_selected": "rgb(12, 79, 65)",
      "tab_text": "rgb(3, 161, 126)",
      "toolbar_field_border_focus": "rgba(25, 89, 113, 0.81)",
      "toolbar_field_highlight_text": "rgb(0, 133, 104)",
      "toolbar_field_highlight": "rgb(0, 44, 35)",
      "toolbar_field_separator": "rgb(0, 133, 104)",
      "toolbar_top_separator": "rgb(0, 133, 104)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2c669986-56d5-4d8a-b526-ee67fb27c361}"
    }
  }
}