Not sure why, but of late quite a few tabs I've seen have been bereft of favicons (those little icons with the website's logo), replaced by a generic blank page icon. I keep thinking those tabs are showing broken pages, when that is far from the case.

It's really easy to add favicons these days, Wordpress has made it an in-built function for instance (so I added one to Sabotagereviews.com)

It might seem like a small thing but it's an easy way to add credibility to your website.