I used it for quite some time after a friend recommended it and went back to IE for it is more user friendly.
As of this point in time, while I conduct various forms of business on line, I have found that none restrict me to the use of IE. Entities which formerly did require IE either have become compatible with Firefox or have created other means to work around limiting folk to IE. [Discover Card is an example.]
if I'm online and have to go to a website that only accepts IE, I'll get their e-mail and send them a note telling them that until they accept firefox, I'll not be visiting..I don't use IE and will not under any circumstances unless work required..and fortunately, I have to use IE there but it's on a company network that's isolated..otherwise, it's firefox for me..
"As many on line applications only accept IE as their default I would like to know how you would allow them to accept Fire fox."
easy, use firefox for your day to day sites, avoid the porn sites, and only use IE for the online application sites that require IE. Don't connect to any other site with IE except the application. This isn't foolproof but it does minimize the risk.
It's the apps that require IE that are infuriating. Quickbooks Pro requires IE.
A fundraising donor tracking package a lot of nonprofits use is Giftworks from MissionResearch is just a script running in IE, and as admin at that. They'll get killed by this. Heck, they get killed by the Kodak photo CDs from the Big Box stores, that one rewrites IE.
Lots of buck$ for those that repair computers.
This generally works with most sites.
And those are the ones I don't use. I've blown off many online stores since their sites only worked in IE, even though they had what I want. About the only things I use IE for are Windows Update and managing Virtual Server.