This article applies to the deprecated Zotero for Firefox (pre-Zotero 5.0) plugin. It no longer applies to the current versions of Zotero.
Can I open snapshots in a new tab or window? (Zotero for Firefox)
Yes. When you double click a snapshot in your Zotero library, or right-click the snapshot and select “View Snapshot”, the snapshot will open in the currently active Firefox tab. To open the snapshot in a new tab and keep focus on the current tab, select “View Snapshot” while holding the Control key (Command key on OS X). To open the snapshot in a new tab and shift focus to the new tab, select “View Snapshot” while holding the Control and Shift keys (Command and Shift keys on OS X). To open the snapshot in a new window, selecting “View Snapshot” while holding the Shift key.