Google-chrome – Get Skype extension for Google Chrome

If the extension is not available on the Chrome Web store, then it will not be synced. I've seen this happen to several extensions which are in private beta (Xobni), or are not available in Chrome Webstore ( eg: user scripts) or those installed from respective websites ( an extension that I created, LastPass).

The only solution is as Peter Maxwell mentioned, to install them manually.

You should be able to unpack the crx to a directory by opening it with an unzip program, for example 7-Zip, Windows Explorer, or WinZip. If you are having a hard time opening it in your zip program of choice, just rename the .crx to a .zip and try again.

Extract the contents to a directory. Then in Chrome, under Settings, go to Extensions, then click "Load unpacked extnesion..." and pick your directory. That should install it. If you get an error, post exactly what error you get.