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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "short_name": "__MSG_extName__",
  "description": "__MSG_extDescription__",
  "version": "1.3.2",
  "default_locale": "en",
  "author": "WebIT-Service",
  "minimum_chrome_version": "88",
  "icons": {
    "16": "assets/mute-16x16.png",
    "32": "assets/mute-32x32.png",
    "48": "assets/mute-48x48.png",
    "128": "assets/mute-128x128.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_title": "__MSG_actionTitle__",
    "default_icon": "assets/mute-16x16.png",
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "commands": {
    "toggle-muting": {
      "suggested_key": {
        "default": "Alt+M"
      },
      "description": "__MSG_toggleOnOff__"
    }
  }
}