By nature, Internet Explorer with active x etc cannot be as secure as Firefox...
United States Computer Emergency Team:
"There are a number of significant vulnerabilities in technologies related to the IE domain/zone...ActiveX (etc)...It is possible to reduce exposure to these vulnerabilities by using a different web browser"
http://www.kb.cert.org/vuls/id/713878
It will be interesting to see what the folks at Microsoft can cook up to improve what they already have.
On top of this, IE7 will still not support web standards, and this drives up the cost of web developing, leaving us consumers ultimately paying the bill.
Compare the results of the web standards test:
The test results are suppose to look like this:
http://common.ziffdavisinternet.com/util_get_image/13/0,1425,sz=1&i=133648,00.jpg
Firefox 2 results:
http://common.ziffdavisinternet.com/util_get_image/13/0,1425,sz=1&i=133649,00.jpg
IE7 results:
http://common.ziffdavisinternet.com/util_get_image/13/0,1425,sz=1&i=133650,00.jpg
Opera results (perfect):
http://common.ziffdavisinternet.com/util_get_image/13/0,1425,sz=1&i=133651,00.jpg
You can try the test here to see that I'm not bu11 sh1ting you:
http://www.webstandards.org/files/acid2/test.html
My bet, when the final versions come out, Firefox will still be more secure simply because it uses different technologies.