So I use the same extension and this piqued my interest. On a standard website, FoxyGestures will pop a status box at the bottom, with the gesture you just drew (UDUDLRLR etc). This is done by appending a div at the end of the html body.
It so happens that the website has a CSS style[0] for the last div in the body with no class and no id (search for `body>div:last-child` in the css) - and use it to indicate "admonition-danger" (maybe to show errors?).
It so happens that the website has a CSS style[0] for the last div in the body with no class and no id (search for `body>div:last-child` in the css) - and use it to indicate "admonition-danger" (maybe to show errors?).
[0]: https://mildbyte.xyz/main.css