Examine source code of TMSCaptcha

{
  "name": "TMSCaptcha",
  "description": "Extension to autofill captcha on Nepse TMS login page. Makes logging into TMS faster and more convenient.",
  "version": "0.3.1",
  "author": "Daze <dazehere@yandex.com>",
  "homepage_url": "https://github.com/arpandaze/tms-captcha",
  "manifest_version": 2,
  "license": "MIT",
  "icons": {
    "48": "assets/icon-48.png",
    "96": "assets/icon-96.png"
  },
  "background": {
    "scripts": [
      "background.firefox.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.nepsetms.com.np/login"
      ],
      "js": [
        "content-script.js",
        "evaluate.js",
        "bold_data.js",
        "slim_data.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "assets/empty.jpg"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "tmscaptcha@arpankoirala.com.np",
      "strict_min_version": "100.0"
    }
  },
  "permissions": [
    "https://*.nepsetms.com.np/*"
  ]
}