Netflix has finally added support for Frame Rate Matching on Amazon Fire TV devices. See here for a thorough explanation of the feature but, in short, this change now allows Fire TVs to change the refresh rate of your TV to exactly match the frame rate of the video being played through Netflix. The result is a perfectly smooth one-to-one correlation between the frames of a video and the frames being shown on the TV, which eliminates video judder artifacts.
Amazon added Frame Rate Matching to Fire TVs way back in 2018 and the Prime Video app supported it right off the bat. Media library and media player apps like Plex, MrMC, Kodi, and quickly supported the feature as well but no other major streaming service apps that I’m aware of have added support for Frame Rate Matching on Fire TV devices. Four years after the feature debuted, Netflix has now finally added support.
For Frame Rate Matching to work, you have to have your Fire TV’s video resolution option set to Auto and have the Frame Rate Matching option set to On. Both of these options can be found under the Fire TV’s Settings > Display & Sounds > Display menu. With those settings set correctly, Netflix will display a message in the top right saying “Frame rate matching is ON” the first time you go to play a video in the app. The message warns you that the screen may flash briefly when content is started because many TVs go black for up to a few seconds as the frame rate switches if they don’t support variable refresh rates.
So far, I’ve only been able to confirm that Frame Rate Matching is supported in Netflix on the 2nd-gen Fire TV Cube. Reddit user theuniquejimmy, who first spotted the new capability, says it’s working on their Fire TV Stick 4K Max as well. The Netflix app version I’m using that supports the feature is version 8.3.4, so try to update your app if your version of Netflix is older.