It brings up the regular Firefox right-click menu.
Operating system
Windows 11
Browser and version (or alternate access method)
Firefox 128.0 (64-bit)
Additional information
It probably shouldn't let you promote things to main if that would make the actual puzzle solution a sideline. But otherwise, it should also let you promote sidelines to main.
Exact URL of where the bug happened
https://lichess.org/training/mix
Steps to reproduce the bug
What did you expect to happen?
It brings up the menu to delete the sideline.
What happened instead?
It brings up the regular Firefox right-click menu.
Operating system
Windows 11
Browser and version (or alternate access method)
Firefox 128.0 (64-bit)
Additional information
It probably shouldn't let you promote things to main if that would make the actual puzzle solution a sideline. But otherwise, it should also let you promote sidelines to main.