by Theo Watson http://muonics.net/
add-on website: http://fffff.at/tourettes-machine/
Tourettes Machine is a firefox plugin that randomly adds swear words to yourform fields and text areas as you type.
Versions:
There are two versions – moderate and extreme.
Moderate – adds insults every 3-5 words.
Extreme – adds insults every other damn word bitch.
Install:
Get the firefox addon here. (mac/pc/linux)






(3 votes, average: 3.67 out of 5)
Firefox Add-Ons Double as Art, Pranks and Fun - Bits Blog - NYTimes.com says:
February 12, 2009 at 4:36 pm
[...] Tourette Machine: This Firefox plug-in will sporadically plant curse words and inappropriate phrases while typing. The extension comes in two flavors: Moderate, which inserts swear words every three to five words and extreme, which injects foul language every other word. [...]