Examine source code of Text Launcher

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "1.1.2",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "textlauncher@toach.biz",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "permissions": [
    "storage",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "content/textlauncher.css",
        "images/icon16_on.png",
        "images/icon16_off.png"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/textlauncher.js"
      ],
      "all_frames": false,
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_icon": {
      "16": "images/icon16_on.png"
    }
  },
  "icons": {
    "16": "images/icon16_on.png",
    "128": "images/icon128.png"
  }
}