Examine source code of JSONView Dracula

{
  "manifest_version": 2,
  "name": "JSONView",
  "version": "2.3.0",
  "description": "__MSG_extensionDescription__",
  "author": "Benjamin Hollis",
  "homepage_url": "https://jsonview.com/",
  "icons": {
    "32": "icon.png",
    "48": "icon48.png",
    "64": "icon64.png",
    "128": "icon128.png",
    "256": "icon256.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "applications": {
    "gecko": {
      "id": "modify_jsonview@brh.numbera.com"
    }
  },
  "web_accessible_resources": [
    "viewer.css",
    "viewer.js"
  ],
  "default_locale": "en"
}