Examine source code of Signed Pages

{
  "manifest_version": 2,
  "name": "Signed Pages",
  "description": "Verifies PGP signed pages for extra security against malicious or breached servers.",
  "version": "0.5.0",
  "homepage_url": "https://github.com/tasn/webext-signed-pages",
  "icons": {
    "48": "images/icon.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "48": "images/icon.png"
    }
  },
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "dist/content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "57.0a1"
    }
  }
}