The list of fully or partially supported APIs is now maintained on [https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Chrome_incompatibilities MDN]. We intend to fix any of the exceptions listed there.
Please see [http://arewewebextensionsyet.com arewewebextensionsyet.com] for an up to date list of supported APIs that is taken by parsing schemas defined in mozilla-central.
== List of APIs we will likely support in the future ==