WebExtension API support

Coverage baseline

Coverage by namespace

Percentages compare Orion’s fully implemented functions, events and properties with those supported by the selected baseline — MDN (supported by any browser per MDN’s data, the default), a single browser, or “All sources” (MDN plus the Chrome-only catalog). Chrome-only catalog members count under the Chrome and All-sources baselines. A single-browser baseline omits namespaces that browser does not ship; the MDN view lists everything measurable. Types and parameters are excluded; partial implementations and stubs do not count as implemented.

Coverage by namespace
Namespace	Orion macOS	Orion iOS	APIs not listed in MDN

Find an API

Namespace

Browser columns

More filters

Missing in Orion vs Chrome Missing in Orion vs Firefox Support differs from Chrome Support differs from Firefox Include type definitions Include parameters Include ChromeOS / enterprise APIs Hide entries marked No in every browser

Supported Partial Stub Unsupported

WebExtension API support

Implementation coverage