Along with the new 3rd generation Fire TV, has released their own official Fire TV Ethernet Adapter that also works with the 2nd generation Fire TV Stick.
Which Ethernet adapter for speeds above 100 Mbps? : r/firetvstick
How to Add Ethernet Cable to an Fire TV Stick and Stop Buffering – WirelesSHack
fire-Cable Ethernet Adapter | Connect your TV Stick or other HDMI Streaming device to an Ethernet cable for blazing streaming speeds! Pure enjoyment
fire-Cable Ethernet Adapter for WiFi TVSticks & Streaming Media Players (Connects TV Stick to a Ethernet for Fast Playback, Streaming and Less
Fire TV Stick 4K vs. Chromecast with Google TV (4K): Battle of the 4K streaming devices
OEM Ethernet Adapter for Fire TV Devices and TV Stick 4K PS92LQ
TV Xstream LAN Ethernet Adapter with 3 USB Port Hub for TV Streaming Devices - S
Fire TV Stick 4K Max Review
OEM Ethernet Adapter for Fire TV Devices and TV Stick 4K PS92LQ
3 Port Hub LAN Ethernet Adapter Plus OTG Cable for Fire Stick or Fire Tv3 for sale online
OEM Ethernet Adapter for Fire TV Devices and TV Stick 4K PS92LQ
AreMe 4 Pack OTG Cable Adapter for Fire TV Stick 4K, 90 Degree Left and Right
This all-in-one adapter is the easiest way to add Ethernet to the Fire TV Stick
✅【Compact and Portable】Compatible with Ethernet adapter for fire stick 4k, Google Home Mini, Chromecast Ultra / 3 / 2 / 1 / Audio, Raspberry Pi Zero,
ZEXMTE Ethernet Adapter for Fire TV Stick, Fire Stick Ethernet Adapter, Micro USB to RJ45 Ethernet Adapter, Micro USB Firestick Ethernet Compatible
When to use an Fire TV Ethernet Adapter
USB OTG Cable Ethernet Adapter for Fire Stick 4K TV Cube Max Lite, Alexa Show 2nd Gen, Show 5 and Show 8 : Electronics