Examine source code of VRC FriendPlus

{
  "manifest_version": 2,
  "name": "VRC FriendPlus",
  "version": "0.2.2",
  "description": "VRChatのWebサイトを少し便利にする機能を追加",
  "icons": {
    "128": "img/vfp128.png"
  },
  "permissions": [
    "https://vrchat.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://vrchat.com/*"
      ],
      "js": [
        "scripts/content_script_vrc.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{81678f24-06ff-43e4-a83d-26d82496845e}"
    }
  }
}