What happens is that Peruse opens the youtube video over and over again if accessed via the dropdown menu or just reloads it page without doing anything if accessed directly.
Otherwise: You cannot open HTTP/S links in Peruse. They will (currently) trigger your default browser to open. (That said it should not be doing so continuously).
What version of Peruse are you using?
(Please provide such details as Peruse version and OS with any issues you’re having, it helps with debugging).
There was an issue similar to this in the master branch of Peruse. If you’re on the webId POC build, then that fix should be present.