Examine source code of PIWoP IT

{
  "description": "Our engine constantly compares your 'Price I Want to Pay' (PIWoP) with the item's current price. Notification when price as desired.",
  "manifest_version": 2,
  "name": "PIWoP IT",
  "version": "2.7.3resigned1",
  "icons": {
    "48": "icons/48.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "management",
    "*://piwop.com/",
    "*://pwp.testplat4m.net/"
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/32.png",
    "default_title": "PIWoP it",
    "default_popup": "popup/popup.html"
  },
  "applications": {
    "gecko": {
      "id": "piwopbutton@mozilla.org",
      "strict_min_version": "45.0"
    }
  }
}