bookmarks.BookmarkTreeNodeUnmodifiable type is used to indicate the reason that a node in the bookmark tree (where each node is either a bookmark or a bookmark folder) cannot be changed. This is used as the value of the
bookmarks.BookmarkTreeNode.unmodifiable.unmodifiable field on bookmark nodes.
bookmarks.BookmarkTreeNodeUnmodifiable is a
string which can currently have only one value:
"managed". This indicates that the bookmark node was configured by an administrator or by the custodian of a supervised user (such as a parent, in the case of parental controls).
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