Hi You can download a version of Firefox in English from this [https://www.mozilla.org/en-US/firefox/all/ page]. You may want to make sure that you have a back up of your Firefox Profile so that you can transfer it across to the new version. You can read how to do this [https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles here]. I hope this helps, but if not, please come back here and we can look into a different solution for you.