title: Revolution Slider not working properly in firefox
body: <p>I am developing the website of www.fundacionbiodiversa.org with a revolution slider ver 4.5.6 (the latest available for the theme).
  Everything works perfectly in every device EXCEPT for Firefox, where it presents a lot of issues: font colour don't match, slides blink and shake, weird position issues, and others.
  Technical support for the theme could not give me an answer. They proposed two "solutions" but none worked:
  - <a href="http://www.themepunch.com/home/plugins/wordpress-plugins/revolution-slider-wordpress/changes-on-css-documents-has-no-effects-on-frontend/">http://www.themepunch.com/home/plugins/wordpress-plugins/revolution-slider-wordpress/changes-on-css-documents-has-no-effects-on-frontend/</a>
  - <a href="http://www.themepunch.com/home/plugins/wordpress-plugins/revolution-slider-wordpress/custom-styles-working/">http://www.themepunch.com/home/plugins/wordpress-plugins/revolution-slider-wordpress/custom-styles-working/</a>
  Any suggestions on what can be the problem?</p>