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how can i change language of UI of firefox 4?

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hi using Persian language in menu's, tabs title, etc. is not what i mean. during installation of firefox 4, it didn't ask me what language i want to choose. now i'm encountering a non-English UI. how can i change it to English?

hi using Persian language in menu's, tabs title, etc. is not what i mean. during installation of firefox 4, it didn't ask me what language i want to choose. now i'm encountering a non-English UI. how can i change it to English?

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You cab get the English version from http://www.mozilla.com/en-US/firefox/all.html