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Insecure connection password warning in Firefox
Firefox issues an insecure password warning when a web page's login form is not secure and your information could be stolen.
Add-on Badges
You’ll know if an extension is being regularly reviewed if it has one of the badges listed in this article.
Secure connection failed and Firefox did not connect
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
Website will not allow Firefox to display the page if another site has embedded it
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
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