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how to change menu bar from thai to english ?

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firefox automatically installs Thai version, which is completely undesired. I live in thailand. When i download firefox (en-us) version 3.6.12, the menu is installed in Thailand. How do i change to english version ??

firefox automatically installs Thai version, which is completely undesired. I live in thailand. When i download firefox (en-us) version 3.6.12, the menu is installed in Thailand. How do i change to english 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 Firefox in 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.

See also http://kb.mozillazine.org/about%3Aconfig