If this is a problem with the Maxthon browser then why not just try another browser. There a 4 browsers that for me are more stable and give a better all around performance than Maxthon.
Comodo Dragon,Pale Moon 64, Water Fox and Srware Iron all perform better for me on my PC than Maxthon.
But if you are just wanting to be able to clear your cache just look to the the right under getting started and click on system requirements then scroll down until you see where it has the link to clear both browser and flash cache.