[earthboundkid]

Nope.

> Conditions of having this behavior enabled vary from one browser to another, and have evolved over time.

If you're not running based on a click event, you'll certainly fail.

[bovine3dom]

Perhaps extension code gets different rules. This code works in Firefox without needing interaction from the user: https://github.com/tridactyl/tridactyl/blob/5e8f94ff06bd5f14...

[earthboundkid]

Extensions get different rules.