# Composer preview broken in Firefox ESR 17

**URL:** <https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365>\
**Category:** Bug\
**Created:** [2015年九月16日 18:02 UTC](https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365 "2015-09-16T18:02:38Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![JSey](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jsey/32/3540_2.png) [@JSey](https://meta.discourse.org/u/JSey)\
**Post date:** [2015年九月16日 18:02 UTC](https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365/1 "2015-09-16T18:02:38Z")

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I know that this is quite an old browser version, but the official specs state that FF 14 is the minimum browser requirement, and one of my clients uses this version. Here’s how the composer window looks in Firefox ESR 17:

 ![](https://global.discourse-cdn.com/meta/original/3X/3/e/3e29dde6cea45c2bcf3e2aaf740d462a4cd478e7.png)

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**Author:** ![Falco](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/falco/32/179432_2.png) [@Falco](https://meta.discourse.org/u/Falco)\
**Post date:** [2015年九月16日 18:15 UTC](https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365/2 "2015-09-16T18:15:19Z")

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Add this to your custom CSS:

```plaintext
/* FF 16+ */
#reply-control .wmd-controls .wmd-input, #reply-control .wmd-controls .wmd-preview-scroller, #reply-control .wmd-controls .wmd-preview {
    -moz-box-sizing: border-box;
    min-height: auto;
}
#reply-control .preview-wrapper, #reply-control .textarea-wrapper {
    -moz-box-sizing: border-box;
}

```

PR open here: [Fix composer for FF14+ by xfalcox · Pull Request #3775 · discourse/discourse · GitHub](https://github.com/discourse/discourse/pull/3775)

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<div class="post-metadata">

**Author:** ![JSey](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jsey/32/3540_2.png) [@JSey](https://meta.discourse.org/u/JSey)\
**Post date:** [2015年九月16日 19:16 UTC](https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365/3 "2015-09-16T19:16:45Z")

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Thanks a million. I guess I will sit and wait if the PR gets pulled. And if not, I will add the CSS!

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<div class="post-metadata">

**Author:** ![JSey](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/jsey/32/3540_2.png) [@JSey](https://meta.discourse.org/u/JSey)\
**Post date:** [2015年九月17日 17:31 UTC](https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365/4 "2015-09-17T17:31:15Z")

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Just upgraded to the latest Discourse version: works. Thanks all!

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**Author:** ![zogstrip](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/zogstrip/32/512781_2.png) [@zogstrip](https://meta.discourse.org/u/zogstrip)\
**Post date:** [2015年九月17日 17:48 UTC](https://meta.discourse.org/t/composer-preview-broken-in-firefox-esr-17/33365/5 "2015-09-17T17:48:44Z")

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