# Browser events extension bug

**URL:** https://forum.makecode.com/t/browser-events-extension-bug/43140
**Category:** Arcade
**Tags:** extension
**Created:** [April 5, 2026, 8:52pm UTC](https://forum.makecode.com/t/browser-events-extension-bug/43140 "2026-04-05T20:52:40Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![AlexK](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/alexk/32/33339_2.png) [@AlexK](https://forum.makecode.com/u/AlexK)
#### Post date: [April 5, 2026, 8:53pm UTC](https://forum.makecode.com/t/browser-events-extension-bug/43140/2 "2026-04-05T20:53:36Z")

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This isn’t a bug. The Backspace key, by default, resets the simulator.

You can change that in JavaScript.

> [@Backspace key resets arcade machine when used](https://forum.makecode.com/t/backspace-key-resets-arcade-machine-when-used/38632/2):
>
> You’ll need to disable the system keys (or at least disable the Menu system key). I don’t think there’s a block version of this yet, but here is the code in JavaScript: keymap.setSystemKeys(0, 0, 0, 0)

WoofWoof’s extension has a Blocks version.

> [@Making an extension for every JavaScript exclusive feature I can think of!](https://forum.makecode.com/t/making-an-extension-for-every-javascript-exclusive-feature-i-can-think-of/36766/17):
>
> Apparently, I forgot about this one, WoofWoof! Could just do a simple “disable all system keys” block along with a more elaborate one to customize the keys. I don’t know off hand if there are any existing enums to help with the latter. Holler if you need me to do any digging.

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