Please don't take this the wrong way, but what are you doing with your browser?
Up until a few years ago, I used an oldish single core processor and I never had any problems with the performance of a browser.
For the past few years I've had a dual core processor, and I still have never had any performance problems, despite being on the internet for hours each day.
The only times it's even remotely a problem, is when I try out some HTML5 demo that runs the Unreal Engine through my browser, or something like that.
Rapidly (manually) opening, switching between sometimes 20 tabs always brought FF to a crawl for me and is the reason why I always switched back to Chrome after giving a new FF version a try for a week.
Up until a few years ago, I used an oldish single core processor and I never had any problems with the performance of a browser.
For the past few years I've had a dual core processor, and I still have never had any performance problems, despite being on the internet for hours each day.
The only times it's even remotely a problem, is when I try out some HTML5 demo that runs the Unreal Engine through my browser, or something like that.