I am reading this on Firefox. It's a nice little browser, and very secure for the time being. The real question is how quickly will Mozilla respond when the spyware starts being written for it?
I would recommend to all users of FF and any browser to use one and only one tab/window when doing banking and other security related activities. Spoofing/phishing and content injection seem to be known vulnerabilities as of now.
http://secunia.com/product/4227/
Get Adblock and look at Spoofstick,Tabbrowser Preferences and Tweak Network Settings extensions too.
As an aside I was a latecomer to the Firefox but after trying it I love it. What made me use it was I got tired of prompts after taming ActiveX and scripting in I.E. although IE is better behaved after SP2.
For the guy interested in RSS, try the Sage extension, it is a light easy to use reader and will get you off the ground, if you don't like it is easy to remove.
http://sage.mozdev.org/
The real question is not how quickly will Mozilla respond...the real question is hopw quickly will users respond when the spyware starts being written for it?
For myself, when the spytware counts start to rise in the scanners (AdAware, etc...) I use, I'll switch to Opera or something else, pronto.