Works great. I've been using a bookmarklet for the same purpose, but this gives me a single button in the toolbar.

Docked one star because it needs:
* keyboard shortcut
* automatic application on page load

But as of June 2018, there are no competing Add-Ons in Firefox that have either of those features.

Works well. But really needs an option to be "on by default". It's not practical to have to electively switch it on for every site that uses that awful "sticky headers" anti-pattern.

Great start. Works well with Medium, but messes with Twitter's head! :)
Will try it on other sites as and when they annoy me! :)

Works very well.

BEST ADD-ON EVER! THANK YOU!