Email Tracking for Gmail

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Email Tracking for Gmail",
  "short_name": "EmailTrack",
  "description": "Gmail email tracker software",
  "version": "2.2",
  "icons": {
    "16": "icons/icon-16x16.png",
    "48": "icons/icon-48x48.png",
    "128": "icons/icon-128x128.png"
  },
  "web_accessible_resources": [
    "styles/*",
    "scripts/*",
    "icons/*",
    "images/*"
  ],
  "homepage_url": "https://trackemail.co/",
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "http://mail.google.com/*",
        "https://inbox.google.com/*",
        "http://inbox.google.com/*"
      ],
      "css": [
        "styles/bootstrap.min.css",
        "styles/sb-admin-2.min.css",
        "styles/righttasks.min.css",
        "styles/jquery-ui.min.css",
        "styles/composeStatus.min.css"
      ],
      "js": [
        "scripts/tippy.all.min.js",
        "scripts/jquery-1.12.4.min.js",
        "scripts/bootstrap.min.js",
        "scripts/inboxsdk.js",
        "scripts/jquery-ui.min.js",
        "scripts/moment.min.js",
        "scripts/common.js",
        "scripts/jsmd5.js",
        "scripts/fontawessome.js",
        "scripts/content.js"
      ],
      "run_at": "document_end",
      "all_frames": true
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "https://*.trackemail.co/*",
    "identity"
  ],
  "manifest_version": 2,
  "oauth2": {
    "client_id": "555150528464-snlb32b3scthg23hsejt7voi1fc5er2h.apps.googleusercontent.com",
    "scopes": [
      "profile",
      "email"
    ]
  }
}