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Why the difference

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I have 2 laptops same make but different models. Both use Firefox and they are synced. Why has one a green tick but not the othr? - one image taken by snipping tool one by PRT SCR + Paint

I have 2 laptops same make but different models. Both use Firefox and they are synced. Why has one a green tick but not the othr? - one image taken by snipping tool one by PRT SCR + Paint
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That green tick is probably coming from an extension that isn't installed or enabled on the other device. You can hover this icon and possibly check it in the Inspector via the right-click context menu.

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I found where it's from. -