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Why do some of my Chrome tabs have a blue dot on them like this? enter image description here

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This means that the title has changed. Chrome used to indicate this with a more subtle effect as described in this question: Pinned tab on Google Chrome has a rippling or highlighting effect

It can also mean that a dialog is open on that page, such as an alert or print dialog.

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3

It would also show up in case there is an alert popup.

To view this in action, open 2 tabs. In the first page open console and type:

setTimeout(()=>{alert('hello')},5000);

and press enter. Then navigate to 2nd tab. After 5 sec, you will see a blue dot on the first tab.

enter image description here

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  • Can you provide a bit more detail as to what an alert pop up is? – I say Reinstate Monica Dec 21 '18 at 16:12
2

It means that there is a change of status on that page. The page has changed.

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