It doesn't look like a Firefox permission. I think it comes from one of your addons. What is the full wording of the monit?

See attached screen shot for wording.

Do you have enabled "Search by image" extension?

This permission is mentioned in recent release notes, you can accept it. Or turn off that addon, if you don't need it.

Thank you.

I did have it enabled. I turned it off then on again & see how it goes.

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