Let us undo stuff in this menu. 
From Bookmarks to ever
ything in this menu generally.
There is a marked lack of Orion's implementation of the UndoManager in multiple interfaces. This can have drastic effects, and not only that, there should be a backup system in place in the event of the loss of bookmarks.
Safari has been criticized alot of times due to it's factor of not creating backups with its bookmarks which are easily deletable, albeit they come with a degree of reversability due to Apple already having placed the UndoManager within Safari.
For starters, the undoing of any sidebar related tasks whether it be in: reading list, bookmarks, passwords, or history should conform with Safari as well as Google Chrome.

History menu

So the feature is as follows:
- Press delete key while selecting an entry
- Press command+z
- Entry should be restored unless if the user has exited Orion application. The RAM usage of a text string of 100 characters should be negligible.
The backup system is in another post to be made.