# Topic/Reply Textbox Lagging using Phoenix Patchset on Firefox

**URL:** https://meta.discourse.org/t/topic-reply-textbox-lagging-using-phoenix-patchset-on-firefox/388717
**Category:** Bug
**Tags:** composer
**Created:** [November 17, 2025, 3:42pm UTC](https://meta.discourse.org/t/topic-reply-textbox-lagging-using-phoenix-patchset-on-firefox/388717 "2025-11-17T15:42:31Z")
**Posts on this page:** 1
**Showing post:** 1

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### Author: ![cmahns](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/cmahns/32/329271_2.png) [@cmahns](https://meta.discourse.org/u/cmahns)
#### Post date: [November 17, 2025, 3:42pm UTC](https://meta.discourse.org/t/topic-reply-textbox-lagging-using-phoenix-patchset-on-firefox/388717/1 "2025-11-17T15:42:31Z")

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Hi all, x-posting this bug from the one I filed with Phoenix (Firefox hardening patchset, also used by IronFox on Android):

> **[\[WEB COMPAT\] Textbox Slowness on Discourse Forums](https://codeberg.org/celenity/Phoenix/issues/189)**
>
> \### Confirmation
> 
> \- \[x\] Please confirm that you have already checked the Website Compatibility wiki page (https://phoenix.celenity.dev/compat), and that this issue is NOT currently listed.
> 
> \### Which domain(s) are you experiencing this issue on?
> 
> I...

It seems the issue is relating to the Javascript used by this feature, not sure if this is something that can be resolved or not but figured it was worth flagging. This behavior doesn’t exhibit itself in Chromium browsers, or hardened forks like Vandium

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