I accidentally downloaded Japanese version of Firefox and I've changed to English as the primary language. But for some reason, all of the windows for "open file" "attachments" is in Japanese. I have both languages in my mac but I have my primary language as English. I made sure by going over the settings, removing Japanese, restarting and going back to Firefox to see if it fixed the issue. I also removed Japanese as an alternative language on Firefox as well but nothing seems to fix the problem.

The attachment is what I see every time whenever I open a window in Firefox. No other program has this problem. I can still use the window in Japanese but it bothers me not knowing what is causing this issue.