Examine source code of TrueMoji

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "1.2.0",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon_16x16.png",
    "48": "icons/icon_48x48.png",
    "128": "icons/icon_128x128.png",
    "512": "icons/icon_512x512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "truemoji@extension",
      "strict_min_version": "126.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "notifications",
    "alarms",
    "contextMenus",
    "declarativeNetRequest"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "options_page": "options.html",
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon_16x16.png",
      "32": "icons/icon_48x48.png",
      "48": "icons/icon_48x48.png",
      "128": "icons/icon_128x128.png"
    }
  }
}