-moz-border-radius: 5px;

      -moz-border-radius: 5px 5px 0 0;

hi there, since upgrading to 31.0 thunderbird keeps flickering, i'm running windows 7. Can someone advise what may be the cause as previous versions were completely fine. Timestamp: 23/08/2014 12:13:19 Warning: mutating the [[Prototype]] of an object will cause your code to run very slowly; instead create the object with the correct initial [[Prototype]] value using Object.create Source File: resource://gre/components/steelApplication.js Line: 783 Timestamp: 23/08/2014 12:13:26 Warning: Unknown property '-moz-border-radius'. Declaration dropped. Source File: https://www.mozilla.org/en-GB/thunderbird/release/start/?uri=/thunderbird/start/&locale=en-GB&version=31.0&os=WINNT&buildid=20140717165725 Line: 136, Column: 25 Source Code: -moz-border-radius: 5px; Timestamp: 23/08/2014 12:13:26 Warning: Unknown property '-moz-border-radius'. Declaration dropped. Source File: https://www.mozilla.org/en-GB/thunderbird/release/start/?uri=/thunderbird/start/&locale=en-GB&version=31.0&os=WINNT&buildid=20140717165725 Line: 169, Column: 25 Source Code: -moz-border-radius: 5px 5px 0 0;