The following tests in fast/dom fail:

fast/dom/Element/contains-method.html
fast/dom/Element/id-in-formcollection.html
fast/dom/HTMLAnchorElement/set-href-attribute-host.html
fast/dom/HTMLAnchorElement/set-href-attribute-protocol.html
fast/dom/HTMLInputElement/size-attribute.html
fast/dom/HTMLLinkElement/disabled-attribute.html
fast/dom/HTMLOptionElement/collection-setter-getter.html
fast/dom/NodeList/nodelist-item-call-as-function.html
fast/dom/SelectorAPI/unknown-pseudo.html
fast/dom/Window/Location/window-override-location-using-defineGetter.html
fast/dom/Window/Location/window-override-window-using-defineGetter.html
fast/dom/Window/window-appendages-cleared.html
fast/dom/Window/window-scroll-arguments.html
fast/dom/anchor-origin.html
fast/dom/canvasContext2d-element-attribute-js-null.html
fast/dom/dataset-gc.html
fast/dom/dataset.html
fast/dom/element-attribute-js-null.html
fast/dom/gc-6.html
fast/dom/javascript-url-exception-isolation.html
fast/dom/undetectable-style-filter.html
fast/dom/xmlhttprequest-constructor-in-detached-document.html

We can consider this an umbrella CR, as causes of failures are different.