autohide_sidebar.css - sidebar hides during drag and drop

[dnut]

If you click anything in the sidebar and continue to hold the mouse button while moving the mouse, the sidebar hides, preventing successful completion of the action. To reproduce, open Bookmarks in the sidebar and try to move one of the bookmarks to another location in the list by dragging and dropping. The sidebar will disappear once you start moving the mouse and uc-autohide-sidebar-delay expires.

[MrOtherGuy]

Unfortunately I can't do anything about that. It's a bug in Firefox only affecting Linux.

It was supposed to be fixed in Firefox 113 but it didn't go as smoothly as planned because the fix caused other issues.