How disable/override internal shortcuts like middle-click?

[kobav14]

IMHO This is a very strange "internal" behavior when middle-clicking to delete a bookmark, since the more commonly known behavior is to open the bookmark in a new tab.
But thanks fo Ctrl+Z...

[pfcao]

In abookmark a bookmark is a tab, so it acts like a tab. There is no way to cancel this feature in current version. Hopefully that will change in the future.