Examine source code of emBrace

{
  "manifest_version": 3,
  "name": "emBrace",
  "version": "1.0",
  "description": "emBrace is a browser extension that enables single press quote and brace surround functionality in the browser.",
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png",
    "default_title": "emBrace"
  },
  "icons": {
    "48": "icon.png",
    "64": "icon-64.png",
    "96": "icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "emBrace@mapachillo.space"
    }
  }
}