Web browser version
Always ensure that the version of the web browser you are using is up to date.
Updating your browser is very important, because all sorts of little fixes can be included in updates, many of which are behind-the-scenes.
The most important reason to keep your browser up-to-date is for your own safety and security, and that of your computer. There are many different sorts of security threats that you can be subject to when you're browsing the web: identity theft, phishing sites, viruses, trojans, spyware, adware, and other sorts of malware. Many browser updates will be issued to combat just these problems.