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Import key3.db + logins.json from Firefox to Firefox NIGHTLY

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I can't find a way to import the passwords saved in Firefox 56.0.1 to Firefox Nightly 58.0.a1.

I've saved the key3.db + logins.json, but when copying them in the new profile of Firefox Nightly (closed) my passwords are not imported...

I can't find a way to import the passwords saved in Firefox 56.0.1 to Firefox Nightly 58.0.a1. I've saved the key3.db + logins.json, but when copying them in the new profile of Firefox Nightly (closed) my passwords are not imported...

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Ok it's a problem with the Nightly version. Tried with Firefox Beta 57.0b10 and the passwords are correctly imported.

I'll stick with beta

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Any error messages in the Browser Console if you enable debugging (signon.debug = true)?