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why is there a lock next to the website address?

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there is a lock symbol before the website address.

there is a lock symbol before the website address.

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Green padlock

A green padlock indicates:

The website's address has been verified using an Extended Validation (EV) certificate. The connection between Firefox and the website is encrypted to prevent eavesdropping.

Gray padlock

A gray padlock indicates:

The website's address has been verified. The connection between Firefox and the website is encrypted to prevent eavesdropping.