Hi. I have 1024x768 pixels on my monitor, and on your website horizontal scrollbar appears. I think it's generally a mistake when horizontal scrollbar appears. I don't know global statistics but e.g. in Poland almost 10% of users still use monitors with 1024x768 pixels. It's quite big amount of users. I think these monitors are still popular in the world, so websites should be designed for this resolution.
I think #breadcrumbs is the reason for this horizontal scrollbar appearing.