Examine source code of Custom Titlebar Text

{
  "manifest_version": 2,
  "name": "Custom Titlebar Text",
  "description": "Mozilla Firefox add-on lets you customize the titlebar text according to a rule. This changes the active window title and is useful for auto-type programs such as KeePass for entering correct account credentials.",
  "version": "0.2.1.8resigned1",
  "author": "Hrvoje Šolc",
  "developer": {
    "name": "Hrvoje Šolc",
    "url": "https://github.com/hrvojesolc/Custom-Titlebar-Text"
  },
  "homepage_url": "https://github.com/hrvojesolc/Custom-Titlebar-Text",
  "applications": {
    "gecko": {
      "id": "{b5a43a70-4092-4899-9c44-63799150b35e}"
    }
  },
  "icons": {
    "16": "icons/custom_titlebar_text-16.png",
    "20": "icons/custom_titlebar_text-20.png",
    "24": "icons/custom_titlebar_text-24.png",
    "32": "icons/custom_titlebar_text-32.png",
    "48": "icons/custom_titlebar_text-48.png",
    "64": "icons/custom_titlebar_text-64.png",
    "128": "icons/custom_titlebar_text-128.png",
    "256": "icons/custom_titlebar_text-256.png",
    "512": "icons/custom_titlebar_text-512.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "custom-titlebar-text.js"
      ]
    }
  ],
  "options_ui": {
    "page": "preferences.html",
    "browser_style": true
  },
  "permissions": [
    "storage"
  ]
}