Examine source code of Virtual to 'Virtual'

{
  "name": "virtual to 'virtual'",
  "version": "1.0",
  "description": "The Virtual to 'Virtual' extension places all instances of the word virtual on each webpage within single inverted commas.",
  "applications": {
    "gecko": {
      "id": "garrett@asquare.org"
    }
  },
  "permissions": [
    "tabs",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_action": {
    "default_title": "Virtual to 'virtual'",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/virtual16.png",
      "32": "images/virtual32.png",
      "48": "images/virtual48.png",
      "128": "images/virtual128.png"
    }
  },
  "icons": {
    "16": "images/virtual16.png",
    "32": "images/virtual32.png",
    "48": "images/virtual48.png",
    "128": "images/virtual128.png"
  },
  "manifest_version": 2
}