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---
title: devtools.inspectedWindow.tabId
slug: Mozilla/Add-ons/WebExtensions/API/devtools/inspectedWindow/tabId
page-type: webextension-api-property
browser-compat: webextensions.api.devtools.inspectedWindow.tabId
---
{{AddonSidebar}}
The ID of the {{WebExtAPIRef("tabs.Tab", "tab")}} that this instance of the devtools is attached to, represented as a number.
This can be sent to the extension's background page, so that background page can use the {{WebExtAPIRef("tabs")}} API to interact with the tab:
```js
// devtools-panel.js
const scriptToAttach = "document.body.innerHTML = 'Hi from the devtools';";
attachContentScriptButton.addEventListener("click", () => {
browser.runtime.sendMessage({
tabId: browser.devtools.inspectedWindow.tabId,
script: scriptToAttach,
});
});
```
```js
// background.js
function handleMessage(request, sender, sendResponse) {
browser.tabs.executeScript(request.tabId, {
code: request.script,
});
}
browser.runtime.onMessage.addListener(handleMessage);
```
## Browser compatibility
{{Compat}}
{{WebExtExamples}}
> **Note:** This API is based on Chromium's [`chrome.devtools`](https://developer.chrome.com/docs/extensions/mv3/devtools/) API.
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