JavaScript: Detect all Firefox versions

1157115 pts.
Tags:
Firefox
JavaScript
In JavaScript, is there a way for me to detect all versions of Firefox? Or is there some sort of tool I can use?
1

Answer Wiki

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This will detect any version of Firefox:

var isFirefox = navigator.userAgent.toLowerCase().indexOf('firefox') > -1;

more specifically:

if(navigator.userAgent.toLowerCase().indexOf('firefox') > -1){
     // Do Firefox-related activities
}

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