A quick PSA for those writing mozmill tests: Previously, to select an element by its class attribute you had to use the whole list of classes in the right order.  Adding or removing classes would break the test. Now you can write selectors using a single class: {"class": "just-one-class"} https://bugzilla.mozilla.org/show_bug.cgi?id=1545142 https://hg.mozilla.org/comm-central/rev/92b567487475b1d9044a621c2e8829808ccb4858 -Paul -- Paul Morris Thunderbird.net