Created attachment 742689 [details] screenshot The click-to-play plugin UI from bug 549697 has a button for each plugin where you can choose how plugins are used. That button seems to be sized to the hidden option in the dropdown menu, which doesn't work so well if the current text label is longer than the alternative.
Yes, the "..." should be removed (or generalized), because it implies an offset for the position of the drop-down list, see http://i.imgur.com/BUcbMTI.png
This seems to have been fixed by the patch in bug 868851.
Created attachment 760312 [details] addons manager This is not fixed in 23.0a2 (2013-06-09), 24.0a1 (2013-06-09)