Examine source code of SmartSpending™

{
  "manifest_version": 2,
  "name": "SmartSpending",
  "author": "Reward Gateway (UK) Ltd.",
  "description": "Never miss a deal when you shop online. SmartSpending™ will automatically remind you if there’s a discount you can use.",
  "version": "1.3.0",
  "icons": {
    "16": "assets/ss-icons/colour-16px.png",
    "48": "assets/ss-icons/colour-48px.png",
    "128": "assets/ss-icons/colour-128px.png"
  },
  "options_page": "auth/options.html",
  "options_ui": {
    "page": "auth/options.html",
    "open_in_tab": true
  },
  "permissions": [
    "http://*/*",
    "https://*/*",
    "identity",
    "storage",
    "tabs",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "SmartSpending"
  },
  "web_accessible_resources": [
    "assets/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8865b9d8-ddef-498a-bd23-2cd6a0c09aba}"
    }
  }
}