Examine source code of Anime forest

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Anime forest",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 118, 134, 0)",
      "toolbar_text": "rgb(160, 227, 208)",
      "frame": "rgb(13, 48, 27)",
      "tab_background_text": "rgb(5, 200, 134)",
      "toolbar_field": "rgba(0, 118, 134, 0.15)",
      "toolbar_field_text": "rgb(160, 227, 208)",
      "tab_line": "rgb(12, 67, 75)",
      "popup": "rgba(0, 118, 134, 0.72)",
      "popup_text": "rgb(12, 67, 75)",
      "tab_loading": "rgb(12, 67, 75)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fdbdd940-a417-441c-be1f-f2d1991ed14a}"
    }
  }
}