Examine source code of Browser Breakout

{
  "manifest_version": 2,
  "name": "Browser Breakout",
  "author": "Noé Von-Eiff",
  "description": "Play Breakout on any webpage!",
  "version": "1.2.1",
  "icons": {
    "16": "assets/icon16.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "browser_action": {
    "default_popup": "src/menu/menu.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/constants.js",
        "src/content/utils.js",
        "src/content/InputHandler.js",
        "src/content/ExplosionHandler.js",
        "src/content/DialogHandler.js",
        "src/content/Paddle.js",
        "src/content/Ball.js",
        "src/content/Game.js",
        "src/content/content.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "browser-breakout@dev.com",
      "strict_min_version": "60.0"
    }
  }
}