Firefox has GreaseMonkey and a lot of classic js scripts. The IE7 plugin, IE7Pro, also provides users with this function and has opened a site for visitors, iescripts.org, to exchange custom scripts. It can be seen that the functions of IE7Pro are becoming increasingly complete. Currently, we see a lot of valuable content on this site, such as download scripts for some video sites and auxiliary plugins for some Web2.0 services. Frequent browsers of www cannot afford to miss it. Currently, the two types of js cannot be used universally, and we look forward to experts releasing a conversion tool.