How Can I Target Firefox Exclusively with CSS?

Targeting Firefox Alone with CSS

The ability of conditional comments to target Internet Explorer with browser-specific CSS rules is well-known. However, when the issue stems from the Gecko engine used by Firefox, a different approach is needed. How can CSS rules be exclusively applied to Firefox without affecting other browsers?

A Browser-Capability-Based Solution

A JavaScript browser sniffer is not considered a clean solution for this purpose. Instead, a method that leverages browser capabilities is preferred.

Using @-moz-document

The @-moz-document rule can be used to target Firefox specifically. It works by applying CSS rules to documents that have the 'url-prefix()' function starting with '-moz-'. Firefox is the only browser that currently supports this function.

Example Usage

The following example demonstrates how to use @-moz-document to change the color of an h1 element to red only in Firefox:

@-moz-document url-prefix() {
  h1 {
    color: red;
  }
}

<h1>This should be red in FF</h1>

In other browsers, the h1 element will remain unchanged, as they do not recognize the @-moz-document rule.

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