I know this is old news, but if you still don’t know, this is really a lot of help.
I will explain only for firefox as this is the dummy-proof method.
For firefox, the easiest direct way is:Type: about:config in the Firefox address bar-Search for general.useragent.extra.firefox-Double click on it-Change the default text with this: Firefox/2.0 MEGAUPLOAD 1.0
That’s [...]