Browser.tabs.update({url: "about:home"}); does nothing on Android Nightly 2017-09-11 & earlier

Add-ons Development
#1

I am probably being dumb… my WebExtension uses

browser.tabs.update({url: “about:home”});

which works fine on desktop Firefox (MacOS Nightly, version 2017-09-11)

but it doesn’t work on Android (Nightly, 2017-09-11 and earlier). Nothing happens.

Both of:-

browser.tabs.update({url: “about:blank”}); and browser.tabs.update({url: “https://developer.mozilla.org”});

work as expected on Android Nightly.

Am I missing something (or is this a bug in Android Nightly? I have “tabs” permission set. I tried other permissions but no change.

Thanks for any help from a WebExtension newbie.