html - what does this mean @-moz-document url-prefix() -

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I tried in Google but could not find a good answer, what is the code given below in CSS 

  @ -moz-document url-prefix () {.className {}}   
 Is it saying that only execute the code for Firefox, if doing so The best way to do this is to   
 
 
 This means that the following applies only to Gecko Browser.  
  url-prefix ()  indicates that only when the beginning of the url matches the mail passed in the  url-prefix ()  method Is applicable.  
 An example:  
  url-prefix (http://www.domain.com/page1/)   
 then CSS Will be followed only if the URL of the page starts with

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