FontAwesome doesn't display in Firefox

Question

Related question here.

Boris\' answer to the above question seems to make sense, but I installed the Font Awesome files on my server and the problem remains:

Answer 1

Put in a custom CSS the following (for me it solved the problem):

@font-face
{
  font-family:'FontAwesome';
  src:url('./fontawesome-webfont.eot');
  src:url('./fontawesome-webfont.eot?#iefix') format('embedded-opentype'),
  url('./fontawesome-webfont.woff') format('woff'),
  url('./fontawesome-webfont.ttf') format('truetype'),
  url('./fontawesome-webfont.svg#FontAwesome') format('svg');
  font-weight:normal;
  font-style:normal
}

[class^="icon-"]:before,
[class*=" icon-"]:before
{
  font-family:FontAwesome;
  font-weight:normal;
  font-style:normal;
  display:inline-block;
  text-decoration:inherit
}