Section background image not working on firefox

Question

I have write the following code to make a <section> have a background image. It's working on Chrome and Internet Explorer but it's not shown in firefox.
<style type="text/css">
#profile{
width: 100%;
height: 100px;
background-size: cover;
-webkit-background-size: cover;
-moz-background-size: cover;
background-size: cover;
-o-background-size: cover;
background-image: url(https://pbs.twimg.com/profile_banners/6242932/1483907177/1500x500);
}
</style>
<section id="profile" class="img-responsive">

Answer 1

@Otávio if possible, please post you code in Code Playground so that we can better help you.