Examine source code of NekoBot

{
  "manifest_version": 2,
  "name": "NekoBot",
  "version": "1.1.0",
  "description": "Links in the twitch reward queue are made clickable and open in a new tab!",
  "icons": {
    "48": "icons/NekoBot.png"
  },
  "permissions": [
    "activeTab",
    "webNavigation",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.twitch.tv/popout/*/reward-queue"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8e5b0956-66aa-4729-9c67-bc58fab6bf09}"
    }
  }
}