I have a bookmark collection which i built up for several years know. Today i'd chosen different tags here and there and i'd like to tidy up my collection. I imagine a tool which can do: Define criteria: contains tag, does not contain tag, is (not) in collection, ... Define actions: rename tag, add tag, remove tag, ... The tool walks through all my collections and applies the actions to all bookmarks that match the criteria. Example: Criteria: contains tag "machine" and contains tag "learning" Actions: remove tag "machine" and remove tag "learning" and add tag "machine learning" Or: Criteria: contains tag "photo" and is in collection "arts" Actions: rename tag "photo" to "photography" This is basically an extended feature request of "Merge Tags" because that would be possible too with this approach.