All tabs helper
I used to have All tabs helper icon on my toolbar. At some point it disappeared and I can no longer use it. It's still activated when I look at it in the add-ons section but I can't seem to figure out how to put it back on the toolbar so that I can instantiate (i.e. use) it.
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Firefox 109 comes with the Extensions button in the Navigation Toolbar as the new way to manage your extensions. The panel that opens if you click the Extensions button (puzzle piece icon) serves as overflow area for extensions you install. The legacy chevron (>>) overflow area still exists but is only used for built-in toolbar buttons as found in the Customize page.
In the Extensions button panel, you can click the gear icon 
next to an extension or use the right-click context menu to pin the extension to the toolbar (Pin to Toolbar).
To (re)move the extension from the toolbar back to the Extensions button panel, you can use "Unpin from Toolbar" in the right-click context menu.
More Information:
Extensions need permission to run in private windows when the browser is in private browsing mode (aka "Never Remember History"), otherwise they won't appear in the Extensions panel.
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