This is a regular patch release, which includes some important bug fixes over the previous release. It is fully backwards-compatible to qooxdoo 3.0. Nothing needs to be changed in the JavaScript code of your existing apps if they are based on the previous 3.0 release.
Main reasons for this release were:
See the corresponding bugzilla query for the issues resolved for qooxdoo 3.0.1.
setRequestHeader("Content-Type", "application/json") was called earlier (#7665)qx.ui.tabview.TabButton after icon reset (#5622)@see links work in class comments now. qx.ui.form.TextArea doesn't work in IE 8-10 (#7599)