Bear with me, I am extremely computer illiterate. I can do links but I don't understand how you do more than one link per post because when you go to the other website to get copy their address, you surely lose what you have written on MN. Can anyone explain?
Or open another window and find the other website in that. I constantly have 2 windows open for finding links. If you press 'control' and 'N' at the same time, it will bring up a new window (but if you've been writing a MN post, it won't appear in the 'new' window, but will still be in the old window when you go back to it).
From the window with the link open. try Alt-Tab (or Apple-Tab if you have a mac) to go back to the other window. Alt-Tab cycles through everything you've got running (most recently used first). Let go when you reach the one you want to use. It's usually only one tab away if you are switching back and forth between two windows.