On this website http://shahkarartworks.com/ Some elements are not showing properly on Firefox while other browsers (Chrome, Opera) are OK with this. Well, to be more specific, the "next" and "prev" buttons on "Childhood Work", "Latest Work" and "Midtime Work" pages are not visible unlike other browsers. I don't know what's the reason behind this issue. I manually made this website (without any CMS), so this might be the reason - that I'm lacking any technique in this manually designed website. Kind suggestions are honored. Thanks in advance