Do Not Disturb for Gmail

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_appName__",
  "version": "1.9.5",
  "manifest_version": 2,
  "description": "__MSG_appDescription__",
  "short_name": "__MSG_shortName__",
  "homepage_url": "https://dndemail.com",
  "icons": {
    "16": "images/icon-16.png",
    "128": "images/icon-128.png"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "scripts/jquery-3.3.1.min.js",
      "scripts/background.js",
      "scripts/ga.js"
    ]
  },
  "permissions": [
    "https://mail.google.com/*",
    "storage",
    "alarms"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "scripts/jquery-3.3.1.min.js",
        "scripts/sweetalert.min.js",
        "scripts/bootstrap.min.js",
        "scripts/jquery.timepicker.min.js",
        "scripts/jstz.min.js",
        "scripts/inboxsdk.js",
        "scripts/contentscript.js"
      ],
      "css": [
        "styles/main.css",
        "styles/settings.css",
        "styles/jquery.timepicker.min.css"
      ],
      "run_at": "document_idle",
      "all_frames": true
    },
    {
      "matches": [
        "https://app.dndemail.com/*"
      ],
      "js": [
        "scripts/jquery-3.3.1.min.js",
        "scripts/inline-install.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "content_security_policy": "script-src 'self' https://ssl.google-analytics.com; object-src 'self'",
  "browser_action": {
    "default_title": "Launch Gmail with DNDEmail enabled."
  },
  "web_accessible_resources": [
    "settings.html",
    "images/*.png",
    "scripts/*"
  ]
}