Examine source code of tweakbilibili

{
  "name": "tweakbilibili",
  "version": "1.0.1",
  "manifest_version": 2,
  "description": "Tweak Bilibili",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.bilibili.com/*"
      ],
      "js": [
        "page.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d22f30e-9405-4878-8555-546fb61708ee}"
    }
  }
}