necessity to scroll left and right?

I didn't think was a problem anymore for websites, so I must be missing something. I've searched about for awhile and can't seem to find the answer. In some threads, I need to scroll left to right to see everything. Is there some way I can configure this website or my web browser (usually Firefox) Or my monitor (although this almost never happens anywhere else I go) so that this is not necessary. Thanks in advance for anyone's help.