If you have dual talent specialization, Merge Spec Bars will keep your two sets of action bars synchronized.
If you like, you can still specify some of your bars to maintain different actions, just like normal. For example, you can have your main bar have different spells for your two specs, but your lower-right bar can stay synchronized so that your potions and items don't change.
To configure the addon, you can open Game Menu > Interface > Addons > Merge Spec Bars, or type '/msb' or '/mergespecbars'.
2.0.1 - updated the TOC file to indicate that MSB works with patch 4.3
2.0 - the user may now specify which bars/buttons are synchronized and which ones stay different
1.3 - fixed an issue where some spells (spells from a different spec) were lost from your action bars when you relog
1.2 - fixed an occasional bug that occurred when replacing an item or spell that is not in the client cache
1.1 - minor interface improvements
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