Examine source code of Dynamic Font Resizer

{
  "manifest_version": 2,
  "name": "Dynamic Font Resizer",
  "version": "1.0",
  "description": "Allows users to dynamically resize fonts on webpages.",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Font Resizer"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{43360703-c5c7-4291-b1e2-672dbf96852d}"
    }
  }
}