canvas playback rate

manifest.json

{
  "manifest_version": 3,
  "name": "canvas playback rate",
  "description": "Control tool for playback rate in canvas",
  "_locale": "zh-cn",
  "version": "1.0",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "host_permissions": [
    "https://vshare.sjtu.edu.cn/play/*"
  ],
  "content_scripts": [
    {
      "js": [
        "scripts/content.js"
      ],
      "matches": [
        "https://vshare.sjtu.edu.cn/play/*",
        "https://vshare.sjtu.edu.cn/*",
        "https://oc.sjtu.edu.cn/courses/*"
      ]
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}