Examine source code of Steam Linkfilter Skipper

{
  "name": "Steam Linkfilter Skipper",
  "description": "Skips the 'You are leaving Steam' notice.",
  "manifest_version": 2,
  "version": "2.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{86e7565c-e56f-40ed-9ddd-a36bb042bf14}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "*://*.steamcommunity.com/linkfilter/*",
    "webRequest",
    "webRequestBlocking"
  ],
  "icons": {
    "48": "icons/logo48.png",
    "96": "icons/logo96.png"
  }
}