Is it possible to detect Firefox users in pure CSS?

问题

Is it possible to detect Firefox Browser only with CSS like IE?

for example, IE browser can be detected like:

<!--[if IE 7]>
   /* IMPORTING CSS FOR IE */
<![endif]-->

Can be Firefox browser detected like this code?

回答1:

Not that I know of, but you can try this:

@-moz-document url-prefix() {
 
    #my-id { font-size: 100%; }
 
}

This website has more options as well

You can place this in your CSS file or between your <style type='text/css'> tags in your HTML. Works Fine!

回答2:

Nowadays you can use the @supports CSS rule:

@supports not( -moz-appearance:none ){
  /* Add non-firefox CSS code here */
}

来源：https://stackoverflow.com/questions/5874122/is-it-possible-to-detect-firefox-users-in-pure-css