How do I switch plugins from the default system locale language to the system language?

I have an English Windows system with English as the system language. All my software, including Firefox is in English. However, I have the default system locale set to Russian. This should not have any effect on program UI, but in Firefox it changes the language for all the plugins. How do I stop this? I want everything in English. I did not find anything related to this in about:config.

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