From what I remember, Pocket was &quot;fast tracked&quot; to the Firefox 38 Beta channel just a couple weeks before release. It did not ride the trains from Nightly to Aurora to Beta. This was controversial within Mozilla. We have the pre-release channels for good reasons.<p>The Pocket tracking bug was filed in April 2015 [1] but the feature shipped with Firefox 38.0.5 in June 2015, just two months later.<p>[1] <a href="https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=pocket#c0" rel="nofollow">https:&#x2F;&#x2F;bugzilla.mozilla.org&#x2F;show_bug.cgi?id=pocket#c0</a>