Wavebox supports the same extension ecosystem and set of extension APIs as Chromium & Google Chrome. In addition to this it also provides some additional features over the standard extension APIs.
These pages provide details of those additional APIs and how to use them.
The best place to get started is by using the excellent documentation on the Chrome Developers page
Brainbox Interact with Brainbox
Firefox ContextualIdentities Use the Firefox contextual identities extension api to interact with Wavebox cookie containers
Tabs Interact with the tab system, query & update split-screen
WaveboxApps Update unread badges, notifications & more for apps