Once you share a browser window with a site, you’re allowing that site to see the results of other sites it summons, including your private information. It’s an important web security mechanism that exists in all browsers. For more technical information, see same-origin policy. Websites and ads have always been able to display content from other sites, but websites normally can’t read the pixels that make up the content on other sites. If you share your screen with a malicious website, that website now has the ability to browse as you, using any login information you may have already entered or stored, and to steal your private data. Websites can actively control browser windows, popping up private information from other websites you never intended to share.When sharing a window, a website may passively record what you’re doing, including things you didn’t intend to share. What are the risks of sharing with sites I don't trust?įirefox will warn you not to share when a browser window is visible on your screen unless you trust that website. Screen sharing can be risky if you share a browser window or your whole screen with websites you don't trust.
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