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Learn MoreLearn about add-on signing and what to do if an extension you want to use could not be verified for use in Firefox.
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
Learn more about common misconceptions about Private Browsing in Firefox.
Firefox will show you a "connection is not secure" warning message when a website login page is insecure and information could be stolen.