Countdown Timer for Email

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Countdown Timer for Email",
  "version": "1.1.2",
  "description": "Add a countdown timer to your email, and get the maximum sales conversion.",
  "permissions": [
    "storage",
    "declarativeContent",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "js/init.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "js/initPage.js"
      ]
    }
  ],
  "externally_connectable": {
    "matches": [
      "http://promofeatures.local/*",
      "https://promofeatures.com/*"
    ],
    "ids": [
      "*"
    ]
  },
  "page_action": {
    "default_popup": "views/timers.html",
    "default_icon": {
      "16": "images/logo-16x16.png",
      "32": "images/logo-32x32.png",
      "48": "images/logo-48x48.png",
      "128": "images/logo-128x128.png"
    }
  },
  "icons": {
    "16": "images/logo-16x16.png",
    "32": "images/logo-32x32.png",
    "48": "images/logo-48x48.png",
    "128": "images/logo-128x128.png"
  },
  "manifest_version": 2
}