I find Opera to be a little too bare bones for my liking.
You should probably spend a little more time discovering what Opera can do. There is definitely no way that it can be described as 'bare bones'. I don't keep up with every single feature of every browser, but I am pretty confident that almost any feature Firefox has, Opera had first, and does it better, without having to download and manage additional plugins. In addition to having features Firefox doesn't
I have both Opera and Firefox on my computer and Firefox is always the one I go to because it has tabbed browsing, sleak icons, eye candy interface.
Not only does Opera offer 'tabs', and did so from the beggining, but it offers MDI windows, meaning you can tile and organize the web pages within Opera, like you do applications on your desktop. It has always done this, and is superior to any simple 'tabbed' interface. There are also tons of sweet skins, and the interface is far more customizable than Firefox.
Firefox is good... but not faster, safer or better than Opera.
Take the ACID2 Test:
[url]
http://www.webstandards.org/action/acid2/_
MD