The biggest one is usually the upgrade has fixed some security issues and another would be to clean up some bugs that were in the last version. Each upgrade deals with something that wasn't quite right before and they want you to be comfortable using it.
It is common to encounter Internet Explorer and Google Chrome issues which could be the result of bugs present in the version. Keeping an up-to-date version of your browser makes sure that such bugs are fixed and you could enjoy a better and smooth browsing experience. If you are troubled by such issues there are sites that offer help to fix browser issues.
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