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I use pl_PL.UTF-8 locale, and for some time now Fedora's Firefox loads the English version of a website even if a Polish one exists. Examples include https://getfedora.org/ and https://accounts.firefox.com/ . I have not changed language settings in preferences, which are by default pl, en-us, en. The problem doesn't happen in upstream Firefox.
Seems like we found a dup. *** This bug has been marked as a duplicate of bug 1329855 ***