Does one thing and does it well Rated 5 out of 5 stars

Suggestion:
- make the highlighting color, and maybe attributes (bold, underline...) user configurable
- add ability to highlight different phrases differently, i.e:
"TODO" => background: #ff0000
"XXX" => background: #ffff00; font-weight: bold

Review:

I've been looking for this functionality for quite some time now, and
for the first time ever Mozillas 'Recommended for you' suggestions
payed out.

I was surprised to see that:
- It works!
- Clean and simple ui.
- I'd have imagined that an addon like this would affect the rendering
times in a negative way, but I haven't noticed any complications yet
with some 40+ phrases.

Thank you, Xelf!

This review is for a previous version of the add-on (0.3.3).