lib: let
  withTag = {
    bookmarks,
    tags,
  }: (
    map (x:
      if (builtins.hasAttr "bookmarks" x)
      then {
        inherit (x) name;
        toolbar = true;
        bookmarks = withTag {
          inherit (x) bookmarks;
          tags = [(builtins.toString x.name)] ++ tags;
        };
      }
      else {
        inherit (x) name url;
        tags = (x.tags or []) ++ tags;
      })
    bookmarks
  );
in (
  withTag {
    bookmarks = builtins.fromJSON (builtins.readFile ./bookmarks.json);
    tags = [];
  }
)