ありがとう、ピン留めじゃなくてこれが欲しかった。

Giving it only one star because I can't give it zero stars. This add-on does exactly what I don't want. It does not protect a tab at all. If you click on what should be a locked tab, and then open a new page with the "locked tab" being active, it will replace the link (which the locked tab was supposed to be protecting) with the new URL link. If you think you can "back arrow" to the former page, you won't be able to. It will be GONE! This add on is worse than useless. It's dangerous.

Thank you for your very useful tools. It would be great if this addon could work with discarded tabs. I use Auto Tab Discard and discarded tabs refuse to reload when locked.

I like this add-on except that it doesn't remember locked tabs when restarting FF. This is a pain since FF has to be restarted for updates and closed any time windows requires a restart.