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Alert Message "This page is asking you to confirm that you want to leave - data you have entered may not be saved."

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Is this from Firefox or is this malicious? It seems to pop up only sometimes when I try to close gmail.

Is this from Firefox or is this malicious? It seems to pop up only sometimes when I try to close gmail.
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  • Identifikácia prehliadača: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0

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This is the alert that shows up

This is the alert that shows up
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cor-el
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A website can force a browser to display such a message when for instance you have started to type a new message in case of email or otherwise entered data in a form that hasn't been submitted and would get lost. This is quite normal to see the onbeforeunload dialog in such a case. This can be disabled, but that is normally not recommended.

A website can force a browser to display such a message when for instance you have started to type a new message in case of email or otherwise entered data in a form that hasn't been submitted and would get lost. This is quite normal to see the ''onbeforeunload'' dialog in such a case. This can be disabled, but that is normally not recommended.
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cor-el said

A website can force a browser to display such a message when for instance you have started to type a new message in case of email or otherwise entered data in a form that hasn't been submitted and would get lost. This is quite normal to see the onbeforeunload dialog in such a case. This can be disabled, but that is normally not recommended.

Thanks for the response. I was just curious about this particular message, since I haven't seen it before and I've only seen it on gmail.

''cor-el [[#answer-1230394|said]]'' <blockquote> A website can force a browser to display such a message when for instance you have started to type a new message in case of email or otherwise entered data in a form that hasn't been submitted and would get lost. This is quite normal to see the ''onbeforeunload'' dialog in such a case. This can be disabled, but that is normally not recommended. </blockquote> Thanks for the response. I was just curious about this particular message, since I haven't seen it before and I've only seen it on gmail.
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cor-el
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See also: *https://www.google.com/search?sa=N&num=100&q=onbeforeunload
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