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How do I get rid of the pop-up box that says "Credential Manager Single Sign in"?

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The box reads: "Credential Manager Single Sign In" across the top. Inside the box reads "The system is ready to record your credentials for Welcome to Facebook-logIn. Sign Up or Learn More-Mozilla Firefox. Please enter your login information to access this application." The asks for user name, password, forgot password, confirm forgot password. OK Cancel

I don't want this to appear on my computer. How do I get rid of it?

The box reads: "Credential Manager Single Sign In" across the top. Inside the box reads "The system is ready to record your credentials for Welcome to Facebook-logIn. Sign Up or Learn More-Mozilla Firefox. Please enter your login information to access this application." The asks for user name, password, forgot password, confirm forgot password. OK Cancel I don't want this to appear on my computer. How do I get rid of it?

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could you go to firefox > help > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

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