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How do I delete Add Security Exceptions popup box

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I changed the port for my gmail account which I read in Thunderbird in error and now get the popup Add Security Exception which states "You are about to override how Thunderbird identifies this site. I don't want to override this! just get rid of popup.

I changed the port for my gmail account which I read in Thunderbird in error and now get the popup Add Security Exception which states "You are about to override how Thunderbird identifies this site. I don't want to override this! just get rid of popup.

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I've done the same thing, and can't pick up my email in Thunderbird without addressing the pop-up. How do I re-do everything and get Gmail into Thunderbird correctly? Thanks!