[Matumio]

Thank you, this can replace my own plugin I've hacked together some years ago. (Not published, was mainly a learning exercise.)

The most frustrating thing is: my plugin still works fine. But I cannot easily enable it permanently any more. I can temporary load it. But my own Firefox doesn't allow me to trust myself permanently. Maybe I'd have to submit it for signing or use some special version of Firefox... can't be bothered. It feels so disempowering.