Examine source code of QuickCaptcha

{
  "manifest_version": 2,
  "name": "QuickCaptcha",
  "version": "2.1",
  "description": "Automatically fills the captcha.",
  "author": "Astra",
  "homepage_url": "https://github.com/kartikshriwas",
  "permissions": [
    "webRequest",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/index.js"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon.png",
    "48": "icons/icon.png",
    "96": "icons/icon.png",
    "128": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{12db618c-97ee-4a07-bb1e-bc0a57bf4a50}"
    }
  }
}