Examine source code of Alt Text Viewer

{
  "manifest_version": 2,
  "name": "Alt Text Viewer",
  "version": "3.1",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage"
  ],
  "description": "Shows the alt text of large images seperately beneath the image. Designed for webcomics such as 'Dumbing of Age' and 'XKCD'",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "showAltText.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "backgroundScript.js"
    ]
  },
  "options_ui": {
    "page": "options_page/options.html",
    "browser_style": true
  }
}