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Grey warning triangle on Facebook occasionally. Please help

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Sometimes on Facebook it shows the padlock by the https, but sometimes it will go to a grey warning triangle. It says that some things on the page may be encrypted (like images). Why is this happening and is it normal? Should this be a concern? Thanks.

Sometimes on Facebook it shows the padlock by the https, but sometimes it will go to a grey warning triangle. It says that some things on the page may be encrypted (like images). Why is this happening and is it normal? Should this be a concern? Thanks.

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Oops, your post duplicated. I replied here: https://support.mozilla.org/questions/1022698