https://connect.mozilla.org/t5/discussions/problem-with-black-gray-gradients-in-youtube-hdr-videos-on/m-p/125816#M49662 <P class=""><SPAN>Hello Mozilla Support,</SPAN></P><P class=""><SPAN>I have an issue with video playback in Firefox on YouTube.</SPAN></P><P class=""><SPAN>When I play HDR test videos such as “OLED / Black Level Test - Demo | HDR | 4K”, the dark transitions between black and gray appear blurry, blocky, and heavily pixelated. The gradients are not smooth.</SPAN></P><P class=""><SPAN>However, when I play the exact same video in Google Chrome, the image quality is correct and the dark gradients look smooth without artifacts.</SPAN></P><P class=""><SPAN>This makes me think the issue may be related to Firefox video decoding, HDR handling, color processing, or hardware acceleration.</SPAN></P><P class=""><SPAN>My system configuration:</SPAN></P><UL><LI><SPAN>GPU: NVIDIA GeForce RTX 5090</SPAN></LI><LI><SPAN>Monitor: 27" Dell Alienware AW2725DF</SPAN></LI><LI><SPAN>Connection: DisplayPort (DP)</SPAN></LI><LI><SPAN>Resolution: QHD</SPAN></LI><LI><SPAN>Refresh rate: 240 Hz</SPAN></LI><LI><SPAN>Color depth: 8-bit</SPAN></LI><LI><SPAN>Operating system: Windows 11</SPAN></LI><LI><SPAN>Browser: Firefox</SPAN></LI></UL><P class=""><SPAN>Issue details:</SPAN></P><UL><LI><SPAN>Video source: YouTube HDR videos</SPAN></LI><LI><SPAN>Problem: black and dark gray gradients are blocky/pixelated only in Firefox</SPAN></LI><LI><SPAN>Google Chrome displays the same video correctly on the same system and settings</SPAN></LI></UL><P class=""><SPAN>Could you please help me identify what may be causing this issue and whether there is a known fix or setting adjustment?</SPAN></P><P><SPAN>Thank you.</SPAN></P> Wed, 20 May 2026 10:55:00 GMT MartinDrugda 2026-05-20T10:55:00Z https://connect.mozilla.org/t5/discussions/problem-with-black-gray-gradients-in-youtube-hdr-videos-on/m-p/125816#M49662 <P class=""><SPAN>Hello Mozilla Support,</SPAN></P><P class=""><SPAN>I have an issue with video playback in Firefox on YouTube.</SPAN></P><P class=""><SPAN>When I play HDR test videos such as “OLED / Black Level Test - Demo | HDR | 4K”, the dark transitions between black and gray appear blurry, blocky, and heavily pixelated. The gradients are not smooth.</SPAN></P><P class=""><SPAN>However, when I play the exact same video in Google Chrome, the image quality is correct and the dark gradients look smooth without artifacts.</SPAN></P><P class=""><SPAN>This makes me think the issue may be related to Firefox video decoding, HDR handling, color processing, or hardware acceleration.</SPAN></P><P class=""><SPAN>My system configuration:</SPAN></P><UL><LI><SPAN>GPU: NVIDIA GeForce RTX 5090</SPAN></LI><LI><SPAN>Monitor: 27" Dell Alienware AW2725DF</SPAN></LI><LI><SPAN>Connection: DisplayPort (DP)</SPAN></LI><LI><SPAN>Resolution: QHD</SPAN></LI><LI><SPAN>Refresh rate: 240 Hz</SPAN></LI><LI><SPAN>Color depth: 8-bit</SPAN></LI><LI><SPAN>Operating system: Windows 11</SPAN></LI><LI><SPAN>Browser: Firefox</SPAN></LI></UL><P class=""><SPAN>Issue details:</SPAN></P><UL><LI><SPAN>Video source: YouTube HDR videos</SPAN></LI><LI><SPAN>Problem: black and dark gray gradients are blocky/pixelated only in Firefox</SPAN></LI><LI><SPAN>Google Chrome displays the same video correctly on the same system and settings</SPAN></LI></UL><P class=""><SPAN>Could you please help me identify what may be causing this issue and whether there is a known fix or setting adjustment?</SPAN></P><P><SPAN>Thank you.</SPAN></P> Wed, 20 May 2026 10:55:00 GMT https://connect.mozilla.org/t5/discussions/problem-with-black-gray-gradients-in-youtube-hdr-videos-on/m-p/125816#M49662 MartinDrugda 2026-05-20T10:55:00Z