Examine source code of Open Password Manager

{
  "manifest_version": 3,
  "name": "Open Password Manager",
  "version": "1.2.8",
  "description": "Browser extension for Open Password Manager",
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "scripting"
  ],
  "action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "Open Password Manager",
    "default_icon": {
      "16": "icons/opm-dark-16.png",
      "32": "icons/opm-dark-32.png",
      "48": "icons/opm-dark-48.png",
      "128": "icons/opm-dark-128.png"
    }
  },
  "icons": {
    "16": "icons/opm-dark-16.png",
    "32": "icons/opm-dark-32.png",
    "48": "icons/opm-dark-48.png",
    "128": "icons/opm-dark-128.png"
  },
  "background": {
    "scripts": [
      "src/background/background.firefox.bundle.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "src/content/content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "src/popup/*",
        "src/content/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f3c2a8e-1b4d-4f7a-9c3e-2d1b6a8f0c4e}",
      "strict_min_version": "115.0"
    }
  }
}