Random brushstrokes on windows
On all windows in Firefox, both normal and private, I get what looks like brushstrokes over the text. Generally they disappear when I move the cursor, but they also appear and disappear without mouse moves. I have the same extensions running on other PC's but don't get this happening, only on this newly-built PC. Using Windows 11 version 22H2, Firefox ESR 115.4.0 64-bit. In the sample the brushstroke shows about 80 % down the page. It disappeared after about 30 seconds, and other appeared later. While writing this, the same kind of thing was happening on this page. Extensions Ecosia and Ghostery.
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Does it still happen in Troubleshoot Mode?
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Update your graphics drivers from the manufacturer's site.
If it still happens you may need to disable hardware acceleration.
Tried that: got a driver a year newer (AMD Radeon) and disabled the hardware acceleration. No change, still got the problem.
Επιλεγμένη λύση
Does it still happen in Troubleshoot Mode?
Problem cleared in troubleshoot. So I restarted Firefox and disabled both extensions. Re-enabled them one by one, and the problem still stayed away. Go figure!