Rated 5 out of 5 stars
I have been a big fan of this add-on, and have been using it regularly for over a year!
Developer Justin has been MIA for quite some time now (hope all is well), hence his add-on is unfortunately incompatible with FFv3.5.5 (nor the beta v3.6).
FFv3.5.5 is a much faster browser than its predecessor, so I had to upgrade and leave behind this sorely missed add-on.
Luckily, I have found a similar Chinese add-on called "Zhong Wen" (experimental version) which works beautifully with FFv.3.5.5.
where it lacks in aesthetics with its minimalist simplicity, it more than compensates with its functionality and lightness, which in some sense, speedier than Perapera-kun...
don't get me wrong, I love Perapera-kun, but "Zhong Wen" is works just as wonderfully... and is the sole add-on of its class for the new Firefox.
Here's the add-on link for "Zhong Wen":