This is the newer replacement for the HTMLMaxEngine you may remember from back in the day. This is called Webtastic, and I've signed it to work on OFW, How cool is that. Note though it will also work on CFW as well, but with PSP Go it must be put on a Memory stick in order to work properly.
Step 1: Download the Webtastic1.11_Fixed_Signed and extract the files and you will see the Webtastic folder and in there there will be a PSP folder open that and you will see the Webtastic1.1 folder.
Step 2: Put PSP into USB mode and access your Memory stick (MS) and go into the ms0:/PSP/GAME folder. Now Copy the Webtastic1.1 folder into the PSP/GAME folder from your extracted files and then exit USB Mode.
Step 3: Go to the MS on your PSP's XMB and start the Application, it has a few bugs, like no cursor, but it is faster and works with OFW.