See:
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/runtime/getFrameId
This API is supported in Firefox and Safari. Having it not available in Orion may break extensions relying on these APIs.
Related issue, runtime.getDocumentId():
https://orionfeedback.org/d/14303-runtimegetdocumentid-is-undefined
Version 1.1.1 (149), WebKit 625.1.8
Tahoe (26)
