Examine source code of Collapse for Wikipedia

{
  "manifest_version": 2,
  "name": "Collapse for Wikipedia",
  "version": "0.9.1resigned1",
  "description": "An add-on to collapse by section in Wikipedia. Useful for filtering out information that you don't need.",
  "homepage_url": "https://github.com/fmileshussey/collapseWiki",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.wikipedia.org/wiki/*"
      ],
      "js": [
        "src/collapse.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{90bbcf24-d021-4afd-9ef2-1ec53b49ff76}"
    }
  }
}