Google Inbox Checker (Inbox by Gmail)

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Google Inbox Checker (Inbox by Gmail)",
  "description": "Displays the number of unread messages in your Google Inbox with desktop notifications for new emails.",
  "version": "1.0.16",
  "manifest_version": 2,
  "background": {
    "page": "background.html"
  },
  "options_page": "options.html",
  "browser_action": {
    "default_icon": "assets/inbox_not_logged_in.png"
  },
  "icons": {
    "128": "assets/icon_128.png",
    "256": "assets/icon_256.png"
  },
  "permissions": [
    "tabs",
    "webNavigation",
    "storage",
    "notifications",
    "*://mail.google.com/",
    "*://inbox.google.com/"
  ],
  "content_security_policy": "script-src 'self' https://ssl.google-analytics.com ;object-src 'self'"
}