Do you have to read a html page? Does it completely lack any sort of styling? Then Readable is for you!
Readable adds the following styles to the body of a html page:
padding: 0 25%;
The result: Your page is now readable!
The background is slightly darker and the text is slightly lighter - lower contrast means it is easier to read.
Padding is added to put the content in the middle of the page rather than from the edges, which is horrible to look at.
The font is changed to Helvetica, which is a nice font.
Activate Readable by clicking the icon next to the Omnibar.
Note: this is not magic. Only use on sites with no CSS, it won't fix bad CSS (most of the time)