Examine source code of Niconico-PepperMint+

{
  "manifest_version": 2,
  "name": "Niconico-PepperMint+",
  "description": "ニコニコ動画をもっとクールにする拡張機能",
  "version": "3.1.12",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "64": "icon/64.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "contextMenus",
    "alarms",
    "tabs",
    "scripting",
    "*://*.nicovideo.jp/*",
    "https://fonts.googleapis.com/icon",
    "https://secure-dcdn.cdn.nimg.jp/nicoaccount/usericon/*",
    "https://nicovideo.cdn.nimg.jp/thumbnails/*"
  ],
  "web_accessible_resources": [
    "style/*",
    "watch_injector.js",
    "*://*.nicovideo.jp/*"
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "PepperMint+ クイックパネル",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.nicovideo.jp/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "css": [
        "content-scripts/index.css"
      ],
      "js": [
        "content-scripts/index.js"
      ]
    },
    {
      "matches": [
        "*://*.nicovideo.jp/*"
      ],
      "run_at": "document_end",
      "js": [
        "content-scripts/index_end.js"
      ]
    },
    {
      "matches": [
        "*://inform.nicovideo.jp/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/inform.css"
      ],
      "js": [
        "content-scripts/inform.js"
      ]
    },
    {
      "matches": [
        "*://koken.nicovideo.jp/*"
      ],
      "run_at": "document_start",
      "css": [
        "content-scripts/koken.css"
      ],
      "js": [
        "content-scripts/koken.js"
      ]
    },
    {
      "matches": [
        "*://live.nicovideo.jp/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "css": [
        "content-scripts/live.css"
      ],
      "js": [
        "content-scripts/live.js"
      ]
    },
    {
      "matches": [
        "*://nicoad.nicovideo.jp/video/choice-player-widget/*"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "css": [
        "content-scripts/nicoad.css"
      ],
      "js": [
        "content-scripts/nicoad.js"
      ]
    },
    {
      "matches": [
        "*://dic.nicovideo.jp/*"
      ],
      "run_at": "document_end",
      "js": [
        "content-scripts/nicopedia.js"
      ]
    },
    {
      "matches": [
        "https://www.nicovideo.jp/my*"
      ],
      "js": [
        "content-scripts/postings.js"
      ]
    },
    {
      "matches": [
        "*://www.nicovideo.jp/series/*"
      ],
      "js": [
        "content-scripts/series.js"
      ]
    },
    {
      "matches": [
        "*://www.nicovideo.jp/video_top",
        "*://www.nicovideo.jp/video_top*"
      ],
      "js": [
        "content-scripts/video_top.js"
      ]
    },
    {
      "matches": [
        "*://www.nicovideo.jp/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/watch_seriesStockUpdate.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "niconico-peppermint@cyakigasi.net"
    }
  }
}