Inline block is required by Firefox to allow the text to wrap as expected. 

Otherwise the links wrapping urls are inline by default and word-break has no effect. 

> On 28 Nov 2013, at 13:15, Paul Hayes <notifications@github.com> wrote:
> 
> In app/assets/stylesheets/base.css.scss:
> 
> > @@ -134,6 +134,12 @@ main a {
> >    text-decoration: underline;
> >  }
> >  
> > +// Force long URLs to break
> > +.url {
> > +  word-break: break-all;
> > +  display: inline-block;
> What is the inline-block for?
> 
> —
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