Examine source code of Bigger Golem

{
  "name": "Bigger Golem",
  "manifest_version": 2,
  "version": "2.8.2",
  "description": "An extension to enhance the Little Golem experience.",
  "applications": {
    "gecko": {
      "id": "BiggerGolem@apetre.sc"
    }
  },
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "browser_action": {
    "default_icon": "img/icons/golem32.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.littlegolem.net/jsp/game/*"
      ],
      "js": [
        "lib/jquery-3.2.1.min.js",
        "src/shogi_style.js",
        "src/go_style.js",
        "src/chess_style.js",
        "src/reversi_style.js",
        "src/hex_style.js",
        "src/requests.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://*.littlegolem.net/jsp/info/player_game_list.jsp?*",
        "*://*.littlegolem.net/jsp/info/player.jsp?plid=*"
      ],
      "js": [
        "lib/jquery-3.2.1.min.js",
        "src/stats.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "img/*"
  ],
  "icons": {
    "16": "img/icons/golem16.png",
    "48": "img/icons/golem48.png",
    "128": "img/icons/golem128.png"
  },
  "permissions": [
    "storage",
    "https://littlegolem.net/*",
    "https://www.littlegolem.net/*",
    "http://littlegolem.net/*",
    "http://www.littlegolem.net/*"
  ]
}