PlusOne Counter Button

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "__MSG_extension_name__",
  "short_name": "PlusOneBtnCount",
  "version": "0.1",
  "description": "__MSG_extension_description__",
  "manifest_version": 3,
  "default_locale": "en",
  "icons": {
    "16": "Res/Icons/icon16.png",
    "24": "Res/Icons/icon24.png",
    "32": "Res/Icons/icon32.png",
    "48": "Res/Icons/icon48.png",
    "64": "Res/Icons/icon64.png",
    "128": "Res/Icons/icon128.png"
  },
  "background": {
    "service_worker": "background.js"
  },
  "commands": {
    "add": {
      "suggested_key": "Ctrl+Shift+Y",
      "description": "Add step to total"
    },
    "subtract": {
      "suggested_key": "Ctrl+Shift+H",
      "description": "Subtract step to total"
    },
    "reset-counter": {
      "suggested_key": "Ctrl+Shift+L",
      "description": "Reset counter to 0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://extensionpay.com/*"
      ],
      "js": [
        "ExtPay.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "contextMenus"
  ],
  "optional_permissions": [
    "notifications"
  ],
  "options_page": "options.html",
  "action": {
    "default_icon": {
      "16": "Res/Icons/icon16.png",
      "24": "Res/Icons/icon24.png",
      "32": "Res/Icons/icon32.png",
      "48": "Res/Icons/icon48.png",
      "64": "Res/Icons/icon64.png",
      "128": "Res/Icons/icon128.png"
    }
  }
}