Rated 4 out of 5 stars

Thanks for new changes,
you asked me in you're last reply to test arabic language with addon disabled, my friend I'm a very old FF user it's never been a problem to search with other languages with me.

in order to help you i made a little experiment.
you mentioned that this addon installs duckduckgo to search bar. when i try to use it with arabic words it fails and displays ??? symbols.
so i installed duckduckgo in search bar using a nice Addon called "add to search bar". link: http://mzl.la/17MpSQG
and it works great.
i don't know if it's characters encoding problem (like using utf-8 parameters ).
but what's sure is that you're missing something.

Great thanks again.

This review is for a previous version of the add-on (1.0.5.1-signed).  This user has other reviews of this add-on.

What about when you install DuckDuckGo from their website? To do this, remove DuckDuckGo and go to duckduckgo.com and display the search menu.