For anyone using the native Mastodon web site/app annoyed by the HUGE boost/favourite notifications esp. when the original post contains a link card, there are two ways to get them out of your way:
Find the Notification settings button top-right of the notifications feed (after the '🔔 Notifications' title bar button). Toggle on the 'Show filter bar' option.
Now you have a bar across your notifications feed - pick the 2nd one, 'Mentions', for example.
