The first was not link hijacking. It was a bug, acknowledged and fixed. Don't attribute to malice what can be explained by incompetence.

The second... You are technically right, but I thought you meant the browser was injecting their own ads on someone else's page. The tip button does none of that, it does not disturb the user or gets in the way of any action, can be disabled and is there to help the creators network. I don't see anything to get worked up about.