Limitations

Types get shown with their canonical name (after resolving all aliases and re-exports) regardless of what the code called them. So you'll see lots of impl core::... when the code really wrote impl std::... because std re-exports lots of things from core.
- Probably not possible to fix this without parsing the source code.
It would be nice to show crate versions, but versions are a Cargo thing, not a rustdoc thing, and so it isn't present in the JSON data anywhere.
Related, it's not currenlty possible to show crate types; having a binary and lib crate with the same name won't work.

Enhancements

implement some form of live search, where you can start typing and rsbrowse selects the thing
- initially, within the current pane would be a nice start
- eventually, within the current crate is probably good enough
- globally is probably a bad idea
- let users hit F3 or something to continue to the next match
add child items for generic parameters. Things like Arc<Foo> should have Foo's children visible.