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I just upgraded the latest friefox version, but it always installed in chinese and I want to change it to english, saw so many help options but it didn't work. even I have downloaded the en-us version, but when the installation progress is runned in Chinese and ended up also in Chinese.
how to change it manually?
Not sure how often
== upgrade firefox to a new version
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If you have the Firefox user interface (menu bar) in the wrong language or want to change the current language then you can get the language of your choice here: http://www.mozilla.com/firefox/all.html
Uninstall the current Firefox version, but make sure that you do not remove your personal data. Install the new Firefox version of the wanted language.
See also http://kb.mozillazine.org/Profile_backup and Back up and restore information in Firefox profiles .......... You may need to (re)set the pref "general.useragent.locale" to the preferred language (e.g. "en-US" or "en-GB") on the about:config page. You can open the about:config page via the location bar, like you open a web site. Use the Filter bar at the top of that page to quickly locate the pref.