Installed this to work with Keevault password manager. It stops logging out of KeeVault unless needed. I created a html launcher to open KeeVault and a blank page when I first open firefox so my logins are ready for use.

Fifty gold stars.

This extension can help to prevent a horribly lossy issue, which might be impossible for the developer of the extension to fix without an enhancement to Firefox –

https://github.com/Drive4ik/simple-tab-groups/issues/716#issuecomment-785488256

Simply as an application buildings, must contains the system should be normal - if user wants to close a tab(last) by click or automatic system and firefox caused to be closed the full apps !! Its unexpected. So an addons is needed to prevent close automatically without hit any keys or option to click. Here, this extension requires manually somethings. But no addons is found for automatic. So searching of that function I have found this extension as only. So, my feedback to be placed here to apply for that function - please make the prevention automatic. So when a last tab closed, it will show a "blank tab".

I know this add-on is still in progress, but as it is it's eminently useful to me, as it prevents me from closing the browser when I mistakenly press alt+f4 instead of alt+4.