I promised to thousands of users who used Turkish Deasciifier that I’d release the version compatible with Firefox 4.0 as soon as Mozilla released it. Well, better late than never, it took me some time to find the suitable interval during which I could work on it but finally it is officially reviewed and released. Current users will get it via automatic update mechanism within Firefox. New users can install it by visiting https://addons.mozilla.org/firefox/addon/turkish-deasciifier/.
Enjoy automatic conversion to Turkish letters while using your non-Turkish keyboard.
For users who don’t want to install the add-on but use it online we always have http://turkceyap.appspot.com/ available for your linguistic pleasure.
For more info and news visit http://ileriseviye.org/blog/tag/turkish-deasciifier/. For grabbing the source code and suggesting patches visit https://github.com/emres/jetpack-turkish-deasciifier.