>>I find out that FireFox works well on the web sides I visit regularly. The web sites that don't work usually are poorly designed in general.
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>Firefox is also my default browser, but I prefer Opera's user interface. I regularly visit some sites which don't work very well with Opera, but I can't remember whether I had the same problems with Firefox. As a test I will try to stay away from Opera for a few days, and report my conclusion here.
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>The only reason why I use IE from time to time, is that I can use automation. I have not found any real examples of how you can automate Firefox or Opera.

I don't think you can automate them.