Examine source code of Paced Email

{
  "name": "Paced Email – Temporary, disposable, burners",
  "short_name": "Paced Email",
  "description": "Temporary disposable emails by Paced Email. Temp mail with extra privacy and anonymous identity protection.",
  "version": "2.1.1",
  "manifest_version": 2,
  "icons": {
    "16": "icons/icon_16.png",
    "32": "icons/icon_32.png",
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "browser_action": {
    "default_title": "Paced Email",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "webcomponents-bundle.js",
        "content/index.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "contextMenus",
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    "content/index.css",
    "fonts/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{eaa82c4e-455d-4d22-804a-dc4f0172e1b1}"
    }
  }
}