I have been using and test-using a few portable web browsers, generally the chromium or chrome type. I have mostly put them on as portable. They mostly work excellently. I have avoided installing them. Is the difference really important? What are the disadvantages of having a working unpacked browser instead of a working INSTALLED browser? So far as I find, they work well. I find no trouble unless I just fail to recognize any disadvantages. SlimJet and Comodo Dragon have been the ones I have used. Slimjet as portable, either on the computer or on usb flash drive, seems equivalent to installed Google Chrome. Downloads, Norton ID Safe & Tool Bar, plugins or extensions, all good or same.