Testmy.net
Best internet speed test for your browser
If you're looking to test your browser's internet speed, Testmy.net is your best bet. It runs entirely on HTML5 and PHP, meaning it doesn't require third-party software like Java or Flash to run your test, which can produce more accurate results. That also makes it a useful tool for comparing performance between different browsers. You can also create an account to track your internet speed for future reference or comparison.
It's not the most user-friendly tool, featuring a swath of in-depth data and individualized tests for your download speeds, uploads and latency. In other words, you'll have a lot of information to look through that might not be relevant to you. The design is also a little ugly by speed test standards. It takes a few clicks before you begin a test, which isn't as streamlined as other speed tests that feature big "Go" buttons as soon as you load the page.