Quoting jimm from bug 953012 comment #19 "Now that we have native touch injection apis [bug 941774] we could write a long-tap test." Some things to test are: context menu showing up when long taping links and the URL bar; selecting items by long tapping tiles in start page and so on. See also https://mxr.mozilla.org/mozilla-central/source/browser/metro/base/tests/mochitest/head.js?rev=eed1617efa5c#671

Mass close of bugs in obsolete product https://bugzilla.mozilla.org/show_bug.cgi?id=1350354