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Primary language changed from English to French on all websites

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Previously posted that Firefox changed my primary language from English to French--affecting all websites-- and I can't make it recognize English as my language default. After basic troubleshooting, I followed suggestions posted on the Forum without success. Any additional ideas?

Previously posted that Firefox changed my primary language from English to French--affecting all websites-- and I can't make it recognize English as my language default. After basic troubleshooting, I followed suggestions posted on the Forum without success. Any additional ideas?

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Please, please, continue in the same thread: https://support.mozilla.org/questions/1331467