Gmail POP Sync

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Gmail POP Sync",
  "short_name": "Gmail Fetcher",
  "version": "3.0.0.8",
  "description": "Fetch and synchronize your external POP accounts at the frequency you select.",
  "icons": {
    "16": "img/icon16.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "action": {
    "default_icon": "img/icon16.png",
    "default_popup": "popup.html",
    "default_title": "Gmail POP Sync"
  },
  "content_scripts": [
    {
      "js": [
        "js/jquery-2.1.4.min.js",
        "js/content.min.js"
      ],
      "matches": [
        "https://mail.google.com/*"
      ],
      "css": [
        "css/jquery.gritter.css",
        "css/font-awesome.min.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "img/*.png",
        "js/gmail.min.js",
        "fonts/*",
        "css/*"
      ],
      "matches": [
        "https://mail.google.com/*"
      ]
    }
  ],
  "background": {
    "service_worker": "js/background.min.js"
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://mail.google.com/*",
    "https://geotrack.email/*",
    "https://beta.geotrack.email/*"
  ]
}