Examine source code of emoji read

{
  "manifest_version": 2,
  "name": "Emojeezer",
  "version": "5.0.2",
  "description": "A simple extension to type emojis using the :emoji: syntax.",
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{267fa816-3596-4a88-980a-2cf3e023f57a}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "assets/icon@48px.png",
    "72": "assets/icon@72px.png",
    "256": "assets/icon@256px.png"
  },
  "commands": {
    "show-free-selector": {
      "suggested_key": {
        "default": "Ctrl+Comma"
      },
      "description": "Show the emoji selector"
    }
  },
  "options_ui": {
    "page": "assets/settings.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script-bundle.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background-script-bundle.js"
    ]
  },
  "browser_action": {
    "default_icon": "assets/icon@48px.png",
    "default_title": "Emojeezer",
    "default_popup": "assets/action-popup.html",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "<all_urls>",
    "storage"
  ]
}