Fontawesome icons don't show

[gwenleigh]

• Adding the following didn't work.
• My extension doesn't really use html document. Where am I supposed to add if any of the following links is the solution?

<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">
<link src="http://maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">
<link href="http://maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet”>

References

https://stackoverflow.com/questions/24922833/font-awesome-icons-are-not-working-i-have-included-all-required-files