I can't seem to find HTTPS Everywhere or smooth gestures, two of my most used extensions, anywhere on the new chrome web store. It looks like a new walled garden approach to something that was working well the way it was.
Dunno about Smooth Gestures.
If you want an open approach look to userjs (e.g. userscripts.org); with a little bit of effort you can make a script that works across FF/chrome/opera/probably others. Of course, you'll still find idiots writing things that only work in firefox.