This probably is no surprise to you (it sure was to me), but there is an excellent collection of extensions (@ the time of this post 228) for Firefox (you can also get to Mozilla and Thunderbird ). There are various categories and seem quite cool. I have not tried them yet, but am going to install some soon. Also not sure, if these are cross platform or do they depend on a platform basis. Anyways, if you have not heard of Firefox , then which planet have you been living on? If you are back from Saturn, then I would recommend to install it right away and have fun browsing.