User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101 Firefox/4.0 Build Identifier: Mozilla/5.0 (Windows NT 5.1; rv:2.0) Gecko/20100101 Firefox/4.0 Before I upgraded to FireFox 4, Arabic was OK. Now every word that has "Tashkeel" (diacritized) is cut into many words. this does not happen in IE and other bowrser or FF before 4.0. For example before "Tashkeel": تشكيل الكلمات ونصوص مواقع الإنترنت After Tashkeel: تَ شْ كِ يْ لِ الْ كَلِمَ اتِ وَنُ صُوْصُ مَ وَاقِعٌ الْ إِنْتَرْنِ تْ Which becomes wrong and hard to read. Reproducible: Always Steps to Reproduce: 1. Go to http://tashkeel.googlelabs.com/diacritize 2. Copy&paste the sentence تشكيل الكلمات ونصوص مواقع الإنترنت 3. Click the checkbox below the box then click the button Actual Results: تَ شْ كِ يْ لِ الْ كَلِمَ اتِ وَنُ صُوْصُ مَ وَا قِ عٌ الْ إِنْتَرْنِ تْ Expected Results: تشكيل الكلمات ونصوص مواقع الإنترنت Arabic words can be written without any vowel letters, A word may be all constant letters. (Tashkeel) is like a vowel letter that is added below or above a letter to decide its pronunciation for example: ت is T تَ is TA تِ is TI