Yes it is, but the with the proper ad ons and basic security added, explorer is still the best browser. The only thing the FireFox had going for it was speed, and that is because it has no complexity. With a high speed connection and plenty of RAM, complexity is nice, and speed is not a issue. With products like Zone and adware add ons for popups and the like, you can set it up however you chose, protect all your ports and really feel relatively safe, as long as you run periodic port scans and testing to check your vulnerability level.
These other replacement browsers, and I have tried most of them, have irritation built in and do not give you all the bells and whistles needed like a decent favorites organizer. When you put the add/on's into the mix, you end up with the same vulnerabilities, the same speed and the same potential risks.
So I no longer see a point in them, unless and until they make something really good.
We'll simply have to disagree on that point.
Firefox does things that IE can't do now and probably never will.
With Firefox, I can highlight a sentence on a page and it is copied to the clip board. A middle click pastes it.
I can highlight a non-hyperlinked URL on a webpage such as www.freerepublic.com and drag and drop it onto an empty spot and it will open up a new tab to that page.
I can highlight a word and with a right click do a search of any dictionary or thesaurus I wish...opened into a new tab.
I can, with a right click, duplicate an open tab into a new tab, complete with its history.
I can, with a right click re-open a recently closed tab, complete with its history.
Those are only 5 of the 25 extensions I have tweaked Firefox with. The list goes on and on. I only use IE for pages that are configured to work best with IE. And opening one of those pages in IE is only a right click away.
And the difference between managing Favorites versus Bookmarks is night and day.
I don't begrudge anyone from using what they are most comfortable with regardless of security issues. To each his/her own. But for me, Firefox is all I need or want.