In modern firefox you can click the addons button to view and configure your addons. This does not happen. It just takes you to the page and removes your current tab. This addon can view and configure your addons without leaving the tab.

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README.md

Addons-button-for-xul

In modern firefox you can click the addons button to view and configure your addons. This does not happen. It just takes you to the page and removes your current tab. This addon can view and configure your addons without leaving the tab.

May be called "gmail panel" when adding to toolbar