What does the red icon mean (Firefox address bar)?

I don't recognize the red lego-brick-with-slash icon in my Firefox address bar (URL bar). (See picture)

Can somebody tell me what it means?

inclusive_disjunction2019-05-08T03:02:56Z

Favorite Answer

I believe that means there's content on the page that requires a plugin that is missing or can't be installed. For example, if the page embeds Java or Adobe Flash. Clicking the circle with the "i" in it should display more information.

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