Chrome: The Speedtest web site has long been the go-to method of quickly testing your download speeds, but if you find yourself doing it a lot, you might want a more accessible solution. The Speedtest Chrome extension does just that. The extension does pretty much exactly what you'd expect -- it crams a Speedtest.net into your Omnibar. The extension's useful for a number of reasons though. First, you don't have to stop what you're doing to test your download speeds. Second, it shows you load times on the web site you're currently looking at, which is helpful if you're troubleshooting. As an added bonus, the whole thing is ad-free, which might alone be worth it over the main site.