Try converting the font to different formats and using them together: http://www.font2web.com/

document.querySelector('link[href="css/font-awesome.min.css"]').disabled=true

It looks that Firefox tries to retrieve the font by using the link from the http://www.upsingh.in/ server and those files do not exist and doesn't use the link from the maxcdn.bootstrapcdn.com . *link rel="stylesheet" href="http://www.upsingh.in/css/font-awesome.min.css" I'm not seeing any request from the file hosted on maxcdn.bootstrapcdn.com *http://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css If I delete the link or disable the css/font-awesome.min.css stylesheet then Firefox shows the font for me and I see a request to the maxcdn.bootstrapcdn.com server to get the font *link rel="stylesheet" href="http://www.upsingh.in/css/font-awesome.min.css" *http://maxcdn.bootstrapcdn.com/font-awesome/4.2.0/fonts/fontawesome-webfont.woff?v=4.2.0 You can paste this code in the command line in the Web Console (Firefox/Tools > Web Developer) to test this. <pre><nowiki>document.querySelector('link[href="css/font-awesome.min.css"]').disabled=true</nowiki></pre>

Thanks a lot It worked for me.