moz-places-in-tabs

Makes Firefox open places pages (Bookmarks, Downloads, History) in tabs instead of new windows.

Reference

• PlacesUIUtils.jsm - contains the list of valid left pane container hierarchies used by PlacesOrganizer.
• browser-places.js - contains the original PlacesCommandHook.showPlacesOrganizer() method.
• browser.js - contains the original BrowserDownloadsUI() method.

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This will not be available as a WebExtension because "In Firefox, you can't open (using tabs.create), or navigate to (using tabs.update) privileged URLs" (see tabs).