A proposito de iste extension

You can use this extension to display your tabs as a list in the sidebar and/or in a popup. A second view lists the recently closed tabs. In addition to various standard functions, tabs in the tab bar can be hidden manually or automatically. This helps to reduce the resources used by the browser and provides a better overview in the tab bar. Hidden tabs are still visible and quickly accessible in the list.

Commentos del disveloppatores

Note: Please note that tabs can only be hidden if you are using Firefox version 61 or higher. For version 60, the following setting must first be changed to the value "true":
extensions.webextensions.tabhide.enabled in about:config

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