How Can I Style Firefox Exclusively Using CSS?

Styling Firefox with CSS: An Exclusive Approach

Achieving browser-specific CSS styling is often necessary, particularly when targeting Internet Explorer using conditional comments. However, extending this concept to target only Firefox poses a unique challenge.

Targeting Firefox Exclusively

To selectively apply CSS rules to Firefox alone, the solution lies in harnessing browser capabilities rather than relying on JavaScript sniffers. One such approach utilizes the @-moz-document rule:

@-moz-document Rule

The @-moz-document rule allows Firefox to recognize and apply CSS rules specifically tailored for it. This rule format takes the following syntax:

@-moz-document url-prefix() {
  // Firefox-specific CSS rules
}

Example Usage

To illustrate its usage, consider the following code snippet:

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

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

In Firefox, the h1 element will be rendered in red, while other browsers will ignore this style due to the @-moz-document rule. This approach offers a clean solution that targets Firefox exclusively and ensures that the rules are not applied to any other browsers.

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