GPlayer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "GPlayer",
  "description": "Listen to Gmail's audio",
  "version": "2.60",
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "content_scripts": [
    {
      "js": [
        "audioplayer.js",
        "videocontext.js",
        "main.js"
      ],
      "css": [
        "audioplayer.css",
        "videoplayer.css"
      ],
      "matches": [
        "https://mail.google.com/*",
        "http://mail.google.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "host_permissions": [
    "http://mail.google.com/*",
    "https://mail.google.com/*",
    "https://mail-attachment.googleusercontent.com/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "play.png",
        "pause.png",
        "volume-up.png"
      ],
      "matches": [
        "https://mail.google.com/*",
        "http://mail.google.com/*"
      ]
    }
  ]
}