This extends another addon
Tree Style Tab (TST).
TST allows you to create bookmarks from a tabs tree. The tree structure are saved to created bookmarks as a prefix
> in their title, like follwoing:
TST itself provides ability to open all these bookmarks as a tree. However, if you have very large number of bookmarks in a folder, you may want only a part of them to be opened, for example "a subtree under B1".
This addon adds a new context menu command "Open as a Partial Tree from here" on bookmarks with such tree structure information. On this example, only three bookmarks B1, C1, and C2 will be opened as a tree when you run the command on the B1.
One more addition, this addon provides ability to open bookmarks in container tabs with a tree structure. The feature can be activated on the options page.
