Preview tools for ComfyUI: a floating popup preview, a multi-track video timeline, and a video viewer you can scrub, loop and compare before and after.
https://github.com/Nekodificador/ComfyUI-NKD-Preview-Tools
git clone https://github.com/Nekodificador/ComfyUI-NKD-Preview-Tools
comfy node install comfyui-nkd-preview-tools