Why does Firefox get so slow after a while?

[somebodyThatIUsedToKnow]

I have always been loyal to Firefox, but the fact that it gets so damn slow after a while makes me realise why so many people are switching to Chrome. I have a very high spec PC that should be more than capable of running a web browser (6700k, 16GB DDR4, SSD etc). Granted, I am quite a power user; I generally have multiple windows open across multiple desktops with multiple tabs in each, but I still believe that it should be able to utilise my CPU and perform seamlessly. I have done the same with Chrome and it seemed to manage. I have refreshed Firefox, uninstalled all my addons, updated, reinstalled the program entirely, but none of these seem to help the fact that Firefox desperately underutilises my PC and leaks memory until it crashes. I agree with everything Mozilla stands for and I love Firefox as a browser, but lately, Chrome has been outperforming it in every way.

 

Why does Firefox eventually slow down to the point of being unusable after a while?

Why do intensive web apps in one window influence light browsing in a separate window?

Why does it leak so much memory?

Why weren't these fundamental issues fixed long ago?

Is there any way to prevent this happening so I don't have to switch to Chrome?

 

Thanks.