Examine source code of SpaceGrid

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "SpaceGrid",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(1, 38, 60, 0.49)",
      "toolbar_text": "rgb(171, 205, 225)",
      "frame": "rgb(1, 38, 60)",
      "tab_background_text": "rgb(156, 187, 204)",
      "toolbar_field": "rgb(1, 38, 60)",
      "toolbar_field_text": "rgb(171, 205, 225)",
      "tab_line": "rgb(106, 179, 220)",
      "popup": "rgb(1, 38, 60)",
      "popup_text": "rgb(171, 205, 225)",
      "ntp_text": "rgb(171, 205, 225)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "popup_highlight_text": "rgb(213, 237, 255)",
      "popup_highlight": "rgb(5, 97, 151)",
      "sidebar_border": "rgba(213, 237, 255, 0)",
      "sidebar_highlight_text": "rgb(213, 237, 255)",
      "sidebar_highlight": "rgb(213, 237, 255)",
      "sidebar_text": "rgb(213, 237, 255)",
      "tab_loading": "rgb(106, 179, 220)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{be234966-f740-4fd7-96a9-70f71a488a49}"
    }
  }
}