Firefox custom homepage recently changed. How do I go back?

I remember not too long ago, I could copy/paste blocks of links, in the format of link1|link2|link3|etc, to save current tabs as my homepage if I needed to close firefox and not loose my tabs. But now, I have to manually add and remove each link individually (see screenshot). And it only shows the site domain, not information specific to the actual page I want to keep so I don't know if I'm deleting something that's not needed or important. I usually have 50+ pages that need to managed: saved, removed, reordered, etc. I used to be able to set up one browser window exactly how I want it and click button to save current tabs as home screen. It was so easy.

Is there any way I can revert back to the old way of saving homepages? Or any other suggestions to have tabs reliably reload? I need a solution to be guaranteed to work to not lose important work, using current tabs as homepage accomplished this. This is one of the major reasons I used firefox.