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By mistake I have lost My "Firefox" that was in the English language & instead I have one in a foreign language. How do I change it back yo English?

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I have an apple computer.A week or so ago a window appeared that ask if I wanted an upgrade on Mozilla Firefox & if so click on "Install" which I did. Somehow by mistake this changed my Firefox program from the English language to a foreign language.( I think it might be "Turkish" but not sure.) How do I change it back to English?

I have an apple computer.A week or so ago a window appeared that ask if I wanted an upgrade on Mozilla Firefox & if so click on "Install" which I did. Somehow by mistake this changed my Firefox program from the English language to a foreign language.( I think it might be "Turkish" but not sure.) How do I change it back to English?

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Get english version of Firefox from here

run a clean install and check

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Firefox 4 versions and later do not run on a PowerPC Mac.
Firefox 4 and later require at least OS X 10.5 and an Intel Mac.

For an unofficial Firefox 9 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:

Firefox 3.6.x (Mac OS X 10.4 and later) can be found here: