I like to use Firefox because it is faster and more efficient than other browsers out of my experience. Google chrome is another option that i use because Internet explorer is better for downloading certain software but to surf the net I think firefox is the best one. It usually uses digital certificates when it is being updated to a newer version of firefox. Sometimes if the computer your using is having some errors to have access to a website thats when the digital certificate comes into play. There are many ways to import and export many digital certificates. They can be emailed or once I have access to its own website I can import a digital certificate there.