Examine source code of Site Slash

{
  "manifest_version": 2,
  "name": "Site Slash",
  "version": "1.0",
  "description": "Instantly clears cookies and localStorage for the current site and reloads the tab.",
  "permissions": [
    "browsingData",
    "activeTab",
    "tabs",
    "cookies",
    "storage",
    "history",
    "downloads",
    "notifications"
  ],
  "page_action": {
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    },
    "default_title": "Site Slash - Page eraser"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4415251-9dae-4723-a17f-cf15ef938de7}"
    }
  }
}