xasharma I don't have Brave to test, but maybe it's part of an ad blocking feature?
The cause is probably somewhere in patchMithril.
The prefix error must be where we set m.route.prefix, and the only reason m.route could be undefined is if patchMithril failed and saved a partial version of the Mithril library onto the m global object.
The patchMithril attrs errors doesn't seem related directly to m.route though, because it's 2 different places of patchMithril.
Maybe someone else with access to Brave can confirm if it's an error that happens all the time?
