How do you create google chrome extensions?

I have Chrome installed on multiple computers and signed in with identical Google accounts. While offline, on a plane, I deleted many extensions and bookmarks, and organized my Chrome browser data, while signed in on the same account. I issued a Chrome data sync when I landed and lost all my work, a

• In the future, how do I enable Chrome to respect all changes I make to my data, regardless of which browser session I'm using, all signed in on the same Google account?

• Answer:

  "Any changes that you make to your browser settings will be synced to the Google Account you've used to sign in to Chrome. Changes you make on one computer are automatically reflected on the other computers where you're signed in and have enabled sync." I believe the issue here is that you did all this offline, then forced a sync when you had a connection. Based on experience, all instances have the same priority for sync when used online, so if you are doing anything to Chrome when offline DON'T FORCE SYNC straight away. Just carry on using the device as you have been, as soon as you have a connection. That normally forces the current device/session to become the current master for automatic sync, and the changes you make should cascade from that one :)