diff --git a/src/Operations/Import/Firefox.hs b/src/Operations/Import/Firefox.hs
index c938b73..3a99da9 100644
--- a/src/Operations/Import/Firefox.hs
+++ b/src/Operations/Import/Firefox.hs
@@ -1,5 +1,6 @@
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE TypeApplications #-}
 {-|
 Module      : Operations.Import.Firefox
 Description : Imports from firefox
@@ -44,7 +45,7 @@ import System.Environment
 import GHC.Stack
 
 import Control.Lens
-       (foldMapOf, folded, makeLenses, to, (&), (<>~), (^.))
+       (foldMapOf, folded, has, ix, makeLenses, to, (%~), (&), (<>~), (^.))
 
 import qualified Database.SQLite.Simple as SQL
 
@@ -103,6 +104,8 @@ importFirefox = do
   fs <- (`appEndo` []) <$> runResourceT (runConduit $ stores .| C.mapM bookmarks .| C.foldMap (\f -> Endo (++ f)))
   buukaU $ modify $ \oldState -> F.foldl' update (initialState oldState) fs ^. buuka
   where
-    -- incomplete update
-    update acc f = acc & seen <>~ (f ^. url . to S.singleton)
+    toEntry Firefox{..} = B.BuukaEntry{ B._url = B.URL _url, B._title = Just _title }
+    update acc f = acc
+      & seen <>~ (f ^. url . to S.singleton)
+      & if has (seen . ix (f ^. url)) acc then id else buuka %~ (B.insert (toEntry f))
     initialState oldState = Update oldState (foldMapOf (B._Buuka . folded . B.url . B._URL) S.singleton oldState)