When removing an experiment from the "Experiments" container in "about:addons", closing/re-opening fx will re-enable the experiments even though the "Remove" button was selected, Example: * Select "Remove" under the "Experiments" container in "about:addons". You'll receive a "tile switcher has been removed" message that includes an "undo" at the top. Close/Re-Open fx and go back to "Experiments" in "about:addons" and you should notice that the experiment has been re-enabled. There's three different remove buttons available in the "Experiments" container: - the remove button next to each experiment in the "Experiments" container (susceptible to the above example) - the remove button inside each individual experiment (susceptible to the above example) - the remove button when right clicking on an experiment (removes/disables the experiment and NOT susceptible to the above example) I think we should change the two "Remove" buttons to behave the same as the right click "Remove" button. Once a user selects remove, the experiment will automatically be set as disabled and will stay disabled if fx is restarted rather than returning it as an enabled experiment. Used the following builds: - http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2014-05-29-03-02-07-mozilla-central/ - http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/2014-05-29-00-40-03-mozilla-aurora/

This seems like almost a duplicate of bug 1010397, except in this case you're closing the browser. But I think this should be marked a duplicate because it's about the same basic undo/redo stuff in the addon manager.