Examine source code of Hellow

{
  "background": {
    "scripts": [
      "js/bg.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "24": "images/icon24.png",
      "48": "images/icon48.png"
    },
    "default_popup": "popup.html",
    "default_title": "Hellow"
  },
  "content_scripts": [
    {
      "js": [
        "js/main.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "description": "A simple extension to help you get a url",
  "icons": {
    "24": "images/icon24.png",
    "48": "images/icon48.png",
    "96": "images/icon96.png"
  },
  "manifest_version": 2,
  "name": "Hellow",
  "permissions": [
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "version": "1.0.11",
  "web_accessible_resources": [
    "*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "hellow@addon.mozilla.org",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "collects_personal_data": false,
        "collects_location_data": false,
        "collects_health_data": false,
        "collects_financial_data": false,
        "collects_authentication_info": false,
        "collects_user_activity": false,
        "collects_website_content": false
      }
    }
  }
}