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Window Master
Functionality for multiple screens and windows. Easily open links in other windows or on other screens, move or merge tabs, and move or merge entire windows. With graphical controls for grid positioning.
Process Toggle
Toolbar panel for restarting the application with(out) multiple processes and for changing the maximum number of content processes (this requires Firefox 49 or newer).
To create your own collections, you must have a Mozilla Add-ons account.