Examine source code of Visual Password

{
  "manifest_version": 2,
  "name": "Visual Password",
  "short_name": "Visual Password",
  "version": "1.2.0",
  "description": "A generator for strong and secure passwords using simple actions that are easy to remember and don't need to be written down.",
  "author": "Denis Tulupov",
  "homepage_url": "https://viruseg.github.io/VisualPassword/",
  "icons": {
    "48": "ico48.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "ico48.png"
    },
    "default_popup": "index.html",
    "default_title": "Visual Password"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+V"
      },
      "description": "Open popup"
    }
  },
  "permissions": [
    "clipboardRead",
    "clipboardWrite"
  ],
  "strict_min_version": "58.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5d380261-fe1e-4293-8cd8-287db6a21b30}"
    }
  }
}