Can I see if someone uses snapshots to store parts of my website as images in their laptop, using browser snapshot tool?
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6As opposed to with any other screenshot tool? Why the focus on Firefox snapshots?– Stephen Ostermiller ♦Dec 15, 2022 at 14:39
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15I usually use a screenshot tool that doesn't run in the browser at all. I like the ones where I can draw a box on the screen and it creates an image from that.– Stephen Ostermiller ♦Dec 15, 2022 at 15:10
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18Why would you care?– BergiDec 15, 2022 at 22:15
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6Any images that your web site displays will be available in the browser cache, where the user can retrieve them.– simpleuserDec 16, 2022 at 1:06
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3Android applications can set a "do not allow screenshots" flag, mostly seen in banking apps. I personally find that annoying and there are ways around it, but writing a thin app wrapper with this flag might be enough to fulfill your requeriment.– BoppreHDec 16, 2022 at 8:14
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2 Answers
No, as there is no API for detecting screenshots. It's impossible to arbitrarily know what happens outside the browser as that would be a security issue.
You can track the clicks on the keys like PrtSc with JS
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1Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center.– Community BotDec 18, 2022 at 11:42
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1Wouldn't this particular key be handled by the operating system, so the browser was not even informed of it? Dec 18, 2022 at 18:39