Examine source code of read it fast

{
  "manifest_version": 2,
  "name": "read-it-fast",
  "description": "Rapid reading browser extension using RSVP. Hover over any text while holding a modifier key to read word-by-word at customizable speeds with optimal recognition point highlighting.",
  "version": "1.0.1",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{18fe7df3-e507-4d00-945f-027ec86a8808}"
    }
  },
  "browser_action": {
    "default_title": "Read It Fast",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content-scripts/content.css"
  ]
}