you gotta pay for opera to be ad free..
but personally, it's the browser I use 90% of the time..
it's faster, has better keyboard browsing support.. (eg: press 'z' to go back, 'x' to go forward)...
I love the way it tracks rss feeds...
that being said, it's missing all the plugins you can get for firefox, version 7.54 was not as compatible with strangely coded sites.. ummm.. that's all the bad I can really think of...
give the adware version a try and see if you like it
...
It's very configurable..