How to change browser language in Firefox 4

One method is to uninstall Firefox then download and install another version in a different language. This can be incredibly time consuming though. An alternative is to download a language pack and then change the internal locale string of the browser:

1) Download language pack from here. This mozilla.org page has language packs for most languages. After installing a language pack you will need to restart your browser

2) Change locale string. Navigate to about:config in your address bar. After accepting the ‘here be dragons’ warning set the filter to ‘general.useragent.locale‘, right mouse click on the value and choose modify. Change the language string to the preferred value, for example ‘en-GB’ for British English or ‘fr-FR’ for French.

After a browser restart your Firefox should be in the preferred language.

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