You can find Opera Usb here OperaUsb
The reason why it is a good program is because there are a lot of things u can use, such as speed dial where you can put custom sites to be loaded up for faster use, up to 9 sites.
U can set the page to reload at a custom time, i have mine 4 every 1 in it reloads.(only 4 this page so i know when someone posts something)
Hope u find it usefull
Firefox is what i'd choose for long term uses. Opera is just for quick browsing :D!
The guy the makes the Opera@USB package maintains a special area on his website with the latest weekly builds of Opera 9.5 at: http://950.opera-usb.com/
I really love Opera, but I've been using Firefox more and more since the 3.0 Betas came out. At the moment I have both running.
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