Provides a keyboard shortcut (Shift + Alt + C by default) to create a new tab that retains the current/last-used container.
What is Retainer?
Retainer is a Firefox add-on that allows users to create new tabs that retain the current or last-used container. It provides a convenient keyboard shortcut for quick tab creation and container retention.
This is an updated and improved version of https://addons.mozilla.org/en-US/firefox/addon/new-container-tab/
It provides a keyboard shortcut (Shift + Alt + C by default) to create a new tab that retains the current/last-used container.
You can edit the default shortcut under Add-ons and Themes > Extensions > ⚙️ > Manage Extension Shortcuts > Retainer. New tabs can be restricted to the last-used container in the extension's preferences panel under Add-ons and Themes > Extensions > Retainer > ⋯ > Preferences.
Retainer may not be safe to use and it requires some risky permissions. Exercise caution when installing this add-on. Review carefully before installing.
Retainer has earned a fairly good reputation and likely can be trusted.