diff --git a/docs/device/serial.md b/docs/device/serial.md
index 1210da2f..7b175466 100644
--- a/docs/device/serial.md
+++ b/docs/device/serial.md
@@ -82,42 +82,3 @@ Alternative programs include `minicom` and so on.
 * Open a terminal
 * `ls /dev/cu.*` will return to you a list of serial devices; one of them will look like `/dev/cu.usbmodem1422` (the exact number depends on your computer)
 * `screen /dev/cu.usbmodem1422 115200` will open up the micro:bit's serial output. To exit, hit `Ctrl-A` `Ctrl-D`.
-
-### Chrome Extension
-
-### ~ hint
-
-**Developer Zone!** This is an experimental feature that may change in the future. This is not supported by MakeCode team.
-
-### ~
-
-If you are using the Google Chrome browser, you can use our extension to get serial data streaming in the editor.
-
-* Install the [Extension for micro:bit](https://chrome.google.com/webstore/detail/extension-for-bbc-microbi/cihhkhnngbjlhahcfmhekmbnnjcjdbge?hl=en-US) on the Chrome Web Store.
-* Restart Chrome and open the [web editor](@homeurl@)
-* The serial data will show below the simulator
-
-If the extension is enabled, it will not be possible to access the port/device for the micro:bit from other programs than Chrome.
-
-### Custom Chrome Extensions
-
-### ~ hint
-
-**Developer Zone!** This is an experimental feature that may change in the future and requires understanding how to [build Chrome Extensions](https://developer.chrome.com/extensions/getstarted).
-
-### ~
-
-You can use the ``chromeserial=CHROMEID`` query argument to load your own Chrome Extension in the editor. You can find the ChromeID in the list of extensions or the store URL.
-
-* see the sources of the [micro:bit extension](https://github.com/Microsoft/pxt-microbit/blob/master/clients/chrome/background.ts)
-* the editor will try to connect a port named ``serial`` ([source](https://github.com/Microsoft/pxt-microbit/blob/master/clients/chrome/background.ts#L73))
-* data can be sent back to the editor as JSON payloads ([source](https://github.com/Microsoft/pxt-microbit/blob/master/clients/chrome/background.ts#L42))
-
-```typescript-ignore
-port.postMessage({
-    type: "serial",
-    data: decodedString,
-    id: id
-  }));
-}
-```