User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:55.0) Gecko/20100101 Firefox/55.0 Build ID: 20170824053622 Steps to reproduce: Run the below code in an extension page (e.g. options.html): var url = `data:text/html;Some content`; chrome.tabs.create({url: url}); Actual results: The data URL page cannot be opened. Expected results: The data URL page should be opened. It is unreasonable to block data URLs for tabs create since a data URL page runs in a separated domain and does not have extension privilege at all. It is also meaningless since redirecting to a data URL is allowed for chrome.webRequest and a developer can use chrome.webRequest.onBeforeRequest to redirect an arbitary url to the desired data URL if he/she really wants to. This restriction is annoying for extensions that need to show arbitrary content to the user. This behavior is also different from Chromium and cause incompatibility for extensions/addons.

Also see for context the intent to prevent top level navigation to data URIs: https://groups.google.com/forum/#!topic/mozilla.dev.platform/IC8GNhA-pxk

Isn't this the same as bug 1317166?