A proposito de iste extension

Unload tabs to free up system resources.

Auto Unload is disabled by default, you can enable it in extension options page.

Reasons for permissions required by extension:

Access your data for all websites:
This permission is required to change favicons of tabs before unloading them.
Read and modify bookmarks:
In Firefox 63+ you can right click bookmarks and open bookmarks in a unloaded tab. To do this extension require permission to read bookmarks.
Access browser tabs:
Extension need to know URLs of each tab so it won't unload tab with site that is in whitelist.

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