DynaMark

DynaMark is an addon based on Chromium. While non-English speakers tend to be distracted by all the characters on the screen, it can help users to concentrate on a single sentence at a time by highlighting it. It can fit most of the English website. In popup page users can turn DynaMark on/off and change highlighting color.
When open an English site, click DynaMark popup button and turn DynaMark on. Then choose prefered highlighting color. Click popup page before closing it as is implied on the page.
Press > to go to the next sentence and < to the previous. Hold ctrl while pressing > or < will jump from section to section.