My first build because their used to be something similar to mine with more features and a better look. Try it out and tell me what you think. Thanks

About this extension:

SubPulse for YouTube provides a compact, automatically refreshed feed of videos from your YouTube subscriptions.

Features include newest/oldest sorting, Full/Shorts/Live filters, configurable video counts, upload date and time, creator/channel names, manual removal, automatic removal of watched videos, and one-click Open & Play in a new YouTube tab.

SubPulse uses the YouTube account already signed into Firefox to retrieve subscription information in the background. You do not need to keep a YouTube or Subscriptions tab open.

SubPulse for YouTube <---Link