Examine source code of Font Finder

{
  "manifest_version": 2,
  "name": "Font Finder",
  "version": "1.0",
  "description": "Find and copy the font details from any text on a webpage.",
  "permissions": [
    "activeTab",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "48": "icons/font-icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2b49122a-c222-46e4-96e3-facaeb7a2106}"
    }
  }
}