The best replacement for xmarks is firefox sync.

The best alternatives to xmarks are rated as following:
★★★★★  firefox sync
★★★★  delicious
★★★★  diigo
★★★  pinboard
★★★  lastpass
★★  eversync
★★  chrome bookmarks
★  google sync
★  google bookmarks
★  sync
★  chrome sync
  bookmarks sync
  foxmarks

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Google Trends

Scale is based on the average worldwide traffic of xmarks in all years. Click on graph for more.
xmarks
firefox sync
delicious