After updating to OS X Sierra, Thunderbird's and BlueGriffon's prefwindows are not movable any more. They appear correctly, are resizable, but can't be moved. Just rebuilt BlueGriffon from scratch on Sierra with Xcode 7.3 (7D175) with same result.
This is fixed in mozilla 49 by bug 1070710. Apple added a workaround that applies to for Firefox <= 48, but not for any other apps that use Gecko.
Status: NEW → RESOLVED
Last Resolved: 2 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 1284859
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