Import wizard is invoked from - File Menu using MigrationUtils.showMigrationWizard https://searchfox.org/mozilla-central/source/browser/base/content/browser-sets.inc#35 - about:login -> Import https://searchfox.org/mozilla-central/source/browser/components/aboutlogins/AboutLoginsParent.jsm#273 ActivitySTream used to previously support import settings from new tab (https://github.com/mozilla/activity-stream/issues/2787), this functionality was reverted with https://github.com/mozilla/activity-stream/pull/4918
Bug 1595842 Comment 1 Edit History
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Import wizard is invoked from - File Menu using MigrationUtils.showMigrationWizard https://searchfox.org/mozilla-central/source/browser/base/content/browser-sets.inc#35 - about:login -> Import https://searchfox.org/mozilla-central/source/browser/components/aboutlogins/AboutLoginsParent.jsm#273 ActivityStream used to previously support import settings from new tab (https://github.com/mozilla/activity-stream/issues/2787), this functionality was reverted with https://github.com/mozilla/activity-stream/pull/4918