User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; KDDI-TS3E) Opera 8.60 [ja] Build Identifier: Mozilla/4.0 (compatible; MSIE 6.0; KDDI-TS3E) Opera 8.60 [ja] My Windows XP (SP3) has the following regional options: Default Encoding: Hebrew Location: Japan (Standards and formats: Japanese) And I tried to installed Firefox in Simplified Chinese. I did manage to install it properly by guessing the location of the 'next' button, and it works great now. Reproducible: Always Steps to Reproduce: 1.Download Firefox 3 2.Try to install it over Firefox 2 Actual Results: All the Chinese text in the installer appears as complete gibberish, with letterlike symbols and Hebrew letters Expected Results: Use UTF-16 as the code page for the installer and avoid all such problems.