[H. Jay]

Someone please help. My inbox emails have suddenly disappeared from Firefox inbox. I don't know what I may have done, if anything other than to update Firefox to cause it, but would like them back if at all possible. Thanks.

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Firefox is a browser, it is not an Email client. As stated Firefox does not have an Inbox.You can access your Email via Firefox at your Email providers Web Site. 
Who is your Email provider? Have you logged into your Email providers page and looked in the Spam, Trash, and any other folders for your Emails? Have you contacted your Email providers Support team?

[peppie]

Firefox is a browser, it is not an Email client. As stated Firefox does not have an Inbox.You can access your Email via Firefox at your Email providers Web Site. 
Who is your Email provider? Have you logged into your Email providers page and looked in the Spam, Trash, and any other folders for your Emails? Have you contacted your Email providers Support team?