If you see browser-update.org alert on your PC you need to be very careful. Why is it so? The reason is that this could be a fake alert, whereas the browser you have could have the latest ever possible version. Instead, if you click this pop-up and obey its instruction, the settings of your browser can be amended, and soon you will start experiencing many problems of search engine redirection. Plus, your PC may become full of adwares. This is how browser-update.org pop-up can be dangerous.
Generally the fake alert from site browser-update.org is originated by the team of cyber hackers and crooks who want to implant their malwares into your computer. There are very many potentially unwanted programs today which are spread through such fake alerts, which in reality are a scam, a virus that should be immediately dealt with by many security companies today.
If you've seen fake alert from site browser-update.org or similar sites, keep in mind that they are very dangerous to click them. If you do want to check whether your browser is outdated, go to the menu of it and see what exact version it has and whether there are any updates available at its official site. Generally, if your browser is outdated you should get a direct warning from it. As for browser-update.org alert is must be ignored, whereas the PC should be scanned by a reliable security software. You may do it with GridinSoft Trojan Killer as explained below.