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I can't change language in firefox

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I'm trying to switch firefox dev edition to english

There is no dev-edition version in dnf, snap or flatpack, so i simply installed it by hands (from src i guess). But browser is not in english and i don't know how to switch it back. Everything i found related to "lang" is translations and "preferred language to display pages", there is no "browser lang" or smth

Perhaps i can replace some files somewhere in src?

I'm trying to switch firefox dev edition to english There is no dev-edition version in dnf, snap or flatpack, so i simply installed it by hands (from src i guess). But browser is not in english and i don't know how to switch it back. Everything i found related to "lang" is translations and "preferred language to display pages", there is no "browser lang" or smth Perhaps i can replace some files somewhere in src?

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