Examine source code of Mocklet

{
  "manifest_version": 3,
  "name": "Mocklet DevTools",
  "description": "DevTools panel for recording/importing HAR and creating mocks.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "devtools_page": "devtools.html",
  "action": {
    "default_popup": "popup.html",
    "default_title": "Mocklet",
    "default_icon": {
      "16": "img/icon-16.png",
      "32": "img/favicon-32x32.png",
      "48": "img/icon-48.png",
      "128": "img/icon-128.png"
    }
  },
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "https://app.mocklet.io/*",
    "https://mocklet.io/*"
  ],
  "optional_host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://app.mocklet.io/*",
        "https://mocklet.io/*"
      ],
      "js": [
        "handoff-page-bridge.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "Mocklet@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "img/icon-16.png",
    "32": "img/favicon-32x32.png",
    "48": "img/icon-48.png",
    "64": "img/icon-64.png",
    "128": "img/icon-128.png",
    "512": "img/android-chrome-512x512.png"
  },
  "version": "0.4.2"
}