Created attachment 8577728 [details] Screen Shot 2015-03-15 at 12.47.53.png User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:38.0) Gecko/20100101 Firefox/38.0 Build ID: 20150315004016 Steps to reproduce: Navigate to about:preferences#privacy, choose 'use custom settings for history', check 'clear history when Firefox developer edition closes', click settings. Actual results: I wanted to clear 'offline website data' on quit, so checked it and dismissed the modal. However, as the action buttons (help, cancel, OK) are hidden, I thought the setting would be saved when I dismissed the modal. It wasn't. Expected results: 'Offline website data' setting should have been enabled when I dismissed the modal ('x' in the top right), or the modal should be expanded to show them.