Yes, it is possible to block HDR (High Dynamic Range) content on certain sites in Mozilla Firefox. Here’s how you can do it: Open Firefox Preferences: Click on the menu button (three horizontal lines) in the top-right corner of Firefox, then select "Preferences" (or "Options" on Windows). Go to Privacy & Security: In the left sidebar, click on "Privacy & Security". Scroll down to Permissions: Find the section labeled "Permissions". Manage Permissions: Look for the "Play DRM-controlled content" option and click on the "Settings…" button next to it. Block HDR on Specific Sites: In the dialog that appears, you can add specific websites where you want to block HDR content. Enter the URL of the website and choose "Block". Save Changes: Click "Save Changes" to apply your settings.

Thanks for the reply, but your instructions does not appear to be correct. image There is no "Settings" button next to it plus the DRM option was under "General", not "Privacy & Security".

edit: I'm not sure if it matters, but i'm on the beta client (128.0b6).

Follow-up: It seems that some sites flat out breaks the player and disables them after a while for no reason, even on quality 1 (for example, Twitch.tv). Even tho it "should" work, it seem like youtube and a handful of other sites are the only players where its flawless and rest just breaks after a while.