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FireFox hacker warning

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I can reach the login page for Duolingo.com using Chrome, but FireFox website always says I should advise the site Duplingo when I try to use Firefox. It still loads correctly in Chrome and I can use that. I've been using Duolingo in FF for years with no problem until today. I can't contact Duolingo in FF because of the same message. Suggestions please.

I can reach the login page for Duolingo.com using Chrome, but FireFox website always says I should advise the site Duplingo when I try to use Firefox. It still loads correctly in Chrome and I can use that. I've been using Duolingo in FF for years with no problem until today. I can't contact Duolingo in FF because of the same message. Suggestions please.

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The Duolingo login page appears for me.

Does it still happen in Troubleshoot Mode?