I couldn't have said it better...
There is no reason for any one to leave FireFox, Safari and jump to Opera. Its just another option.
If you can give me a reason, I am all ears
Alright, I'll give you a reason. I have been trying to find a decent web browser that suits my needs for a year now. I'm working on a 2008 White Macbook with 4GB of RAM.
Firefox is slow, it eats memory. It takes a year to start up. I use 2 plugins(download statusbar & adblock) on Firefox which for me are essential. Firefox is so slow for me at times that I decided to switch to Safari. (2 months ago)
Safari is great, fast, fine. It has no plugins that I would like. Download Statusbar is a must for me, I HATE having a separate window. Even putting that aside, I use favicons in my bookmark toolbar, and Safari just won't do that. (i gave up after a week of no productivity)
I switched to Google Chrome. Google Chrome is awesome. I'm not a fan of the layout, but it did the job. Other than Adblock loading all the damn ads and just hiding them(the point of that....?). Flash would bug out all the time. There was no autofill, and I did actually like the somewhat download statusbar thing they had going on. Still, the adblock being retarded, the lack of autofill, and Flash not even responding when I clicked on it(which I know is the result of a bad flash install, but it worked in all the other browsers at that point). After about 1.5 months, I saw this.
I immediately installed Opera 10.10 and was pleasantly pleased. It had all the features I wanted. I didn't have to worry about plugins because everything I think a browser should have, it does. Only thing kind of iffy was the interface. I then installed Opera 10.50, and yes it is buggy as all hell BUT, the time it takes for it to quit and reload all of my websites 5 times is the time it took Firefox to start up. The interface(in my opinion, of course) is gorgeous. It's extremely minimal, extremely customizable, and I absolutely love that you can make the icons as small as you want.
This is my layout. It's so clean! I don't have a problem with reloading every couple of hours if the browser craps out or starts to lag a bit, because that takes a second, as opposed to Firefox crashing(as it has many times) and taking literally like a minute to catch its breath and load all of the tabs that I was in.
For now, I'm sticking with Opera. It's perfect for my needs, and none of those "main" browsers could even come close to fulfilling them.