What's wrong with the download manager? I like it just the way it is, personally.
I've noticed that some people, when they come to staples to buy a new computer, beleive that they should use what comes with their computer, even if they do not understand that IE on a new HP is no better than IE on their 6-month-old HP. They may have used firefox because someone told them to, but they typically think that new stuff is perfect.
I know for a fact that firefox usage is increasing very rapidly near me. Every fellow electronics employee at Staples is now using Firefox, and I stress the importance of Firefox to as many people as it would affect. I'm even getting fellow employees to spread it like i have the last 10 months.
Firefox will have a hard time overcoming IE if it is not bundled with the computers that people buy. Some are just too lazy to go and download the browser. I write down the website for dozens of people a day (and the regular customers usually come back for other various things, and affirm that they are using (and love) firefox), but some are even adimately opposed to not using a microsoft product. that is what scares me.
(for those who are interested: Last Nov. there were few people who heard of firefox. around April/May, many have heard of it, and lately many say that they downloaded it, but just haven't used it yet. I encourage them to start using it. [this may explain the high download rate and lowering usershare])