Last week the Chromium Linux Dev Channel updated adding the extensions manager in “Wrench” Menu.
Chromium 184.108.40.206 (Ubuntu build 30813) update adds a dis-activated ‘Sync my Bookmarks’ in the ‘Wrench’ menu – that means bookmark syncing in Chromium Linux without a plug-in is around the corner, it might be activated in the next update. Qui vivra verra.
A recent Chromium build for Windows update converts Greasemonkey user scripts into extensions. This feature still has to make its way into Chromium builds for Linux.