edit: locking duplicate topic, please continue at https://support.mozilla.org/en-US/questions/1264272 Hey guys I finally gave up and installed latest update of firefox ( 68.0). And now like always after update I need to spend hours trying to fix some issues :( This time this is the user interface. Since I live in Estonia, after update mozilla decided to change user interface language to estonian ( I want English user interface). I changed language everywhere I could, googled it, and still part of mozilla is in estonian ( check screenshots). I found similar topic on support channel, and reinstalled NEW firefox client in ENGLISH, but still somehow part of menu is in Estonian. God, I am so sorry for this crying, but I am really so depressed. Such a waste of time over so simple issue, however none of the changing setting rly help. Looking forward to you guys :) Have a nice day !