When I search for a video, it tries to launch a popup window for another domain (sepiasearch.org) which Firefox blocks. Seems confusing for a typical viewer
For information, Sepia Search is the search engine of PeerTube videos, channels and playlists, developed by Framasoft (developer of PeerTube)
And then if you click on one of the search results it will open in yet another popup with yet another weird domain with some oddball TLD like .win which looks even more sketchy.