Firefox is a very nice browser. I like it a lot. But in my opinion, Opera is a
much better browser
with a better overall user experience.

I have both Firefox and Opera installed on my machines and use both of them but
I am more biased
toward Opera.

For a more detailed list of Opera's features have a look at:
http://www.opera.com/products/desktop/ but here comes a small summary:

> > 1. Are you using each new IE page for a single page you visit? ...

Opera supported tabbed browsing a long time before any Mozilla browser. And
Opera's tabbed
browsing is better than Firefox. You can Ctrl+Tab, see a list of open windows,
and choose the one
you like. Version 9 also supports "tab previews" which is even better.

> > 2. Are you tired of seeing Advertisements every where on every ...

Opera also has this nice feature called pop-up blocking however it doesn't work
as good as
Firefox's.

> > 3. How do you download a file from internet? Are you using IE ...

In this regard Firefox is much better than Opera. More than a year  ago I
suggested (in Opera
forums) that it would be nice to add a download accelerator kind of thing to
Opera but it wasn't
welcomed that much. Nevertheless, Opera supports resuming broken downloads as
well but it's not
implemented very carefuly. A plus for Opera 9 is its support for downloading
torrent files (with
full support for resume, etc.) out of the box.

> > 4. Do you want to change the look and feel of the browser? There are ...

Opera's skins are far better than Firefox's IMHO.

> > 1. Do you want to get detail information of each page form element? ...

+1 for Firefox.

> > 2. Do you want to change css on the fly and see what happens? ...

ALAICR, Opera supports this as well.

> > 3. Do you want to know the detail information of you html tables? ...

+1 for Firefox.

> > 4. FireFox versions are more mature. I've experienced that an ...

Opera is just as mature as Firefox (at least.)

> > 5. FireFox can be installed on the Linux and Mac too. ...

Opera too. Plus, it can be installed on your cell phones as well. It's the No. 1
browser for cell
phones both in terms of market share and features.

- You can download Opera from: http://www.opera.com/download
- You can change the skin of your Opera browser  by the click of a single link
(no need to
restart): http://my.opera.com/community/customize/
- You can create your very own blog, photo albums (300 megs of free space), etc.
on
http://my.opera.com for free