Multiple Windows in standalone
                    Would be great to be able to open multiple Zotero windows in Standalone. Use cases: each window could have a different Collection open, allowing for comparison across contents or simultaneous views into the different Collections. For Mac OS, a different Zotero window could be open in each Space to serve different projects divided across the Spaces.                
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 Upgrade Storage
 Upgrade Storage
One thing I'd change is Gracile's suggestion: tabs should be of the breakaway sort, so they can be pulled off as a separate window, combined with other selected tabs, and allow easy comparison between collections.
I was hoping this would show up in Version 5, but no such luck.