Steep and Cheap Countdown Timer

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Steep and Cheap Countdown Timer",
  "description": "Steep and Cheap sells outdoor gear one screamin'(50-80% off) deal at a time until time runs out. (steepandcheap.com)",
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "version": "4.5.0",
  "browser_action": {
    "default_icon": {
      "19": "icon.png",
      "38": "icon76.png"
    },
    "default_popup": "popup.html"
  },
  "permissions": [
    "notifications",
    "*://www.steepandcheap.com/",
    "*://www.backcountry.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://www.steepandcheap.com/steepcheap/cart/add.html"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}