<a href="https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;Mobile&#x2F;Gecko-iOS" rel="nofollow">https:&#x2F;&#x2F;wiki.mozilla.org&#x2F;Mobile&#x2F;Gecko-iOS</a> links to <a href="https:&#x2F;&#x2F;hg.mozilla.org&#x2F;users&#x2F;tmielczarek_mozilla.com&#x2F;gecko-ios&#x2F;" rel="nofollow">https:&#x2F;&#x2F;hg.mozilla.org&#x2F;users&#x2F;tmielczarek_mozilla.com&#x2F;gecko-i...</a> which exists, again without much of a UI.  The build instructions are in the wiki.