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After a website had entered fullscreen mode, it could have used a previously opened popup to obscure the notification that indicates the browser is in fullscreen mode. Combined with spoofing the browser chrome, this could have led to confusing the user about the current origin of the page and credential theft or other attacks. This vulnerability affects Firefox < 74.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade librewolfUpgrade firefox | Aug 22, 2024 | Mar 25, 2020 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Mar 25, 2020 |
| Mfsa2020 08 | — | Upgrade to Mozilla Firefox version 74.0Upgrade to the latest version of Mozilla Firefox | Mar 11, 2020 | Mar 10, 2020 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Mar 25, 2020 |
| Ubuntu | — | Upgrade firefox | Mar 12, 2020 | Mar 11, 2020 |
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