Firefox O'Reilly Online-Book Legiblizer

I find O'Reilly's online books to be hard to read. The font is too small, and the lines are too close together.

Here's a bookmarklet that increases the font size, increases the line spacing, and changes the font: O'Reilly Legiblize. Drag it to your Firefox toolbar, then click it while reading an O'Reilly online book.

Before legiblizing:



After legiblizing:



Much better.

(Font, font size, and line spacing can be adjusted to taste.)