Most do, they WANT you to save an easy launch link on the desktop.
I believe it was Firefox that was FIRST with tabbed browsing, with IE 7 nicking the idea.
The downside with Firefox is that so many websites are written and tested with IE, and not necessarily with the other browsers. IE, being the most common, is the most attacked browser when it comes to malware.
Microsoft have cemented their monopoly by not adhering to some of the agreed HTML standards, which leaves IE in a dominant position as web developers have to write non-standard pages to work with some IE functions.
IE is also written to work seamlessly
with Windows, and Microsoft secrecy inhibits other browsers from being coded to work so intimately with Windows.
I have seen others post that it is possible to get MG casinos to work under Linux/Obuntu by using a Windows emulator, and that there is such an emulator with the MAC.