It seems that Firefox really doesn't like us doing this to it. Most recent update breaks the sleeping tabs again, so they cannot be awoken or recovered if the browser is force-restarted by Ffx updates. That had been fixed previously, but seems to be back. Otherwise, good tool.

THANK YOU FOR YOUR HARD WORK, this extension is perfect, works well, not too heavy and actively developed !!!

Hello developer.
After updated to v1.2.5, the tabs usually change position when it's waking, then I return to v1.2.3, runs well.
Today I update to v1.2.9, this issue still occurs.
Hope you can fix this issue, thanks.

This is useful extension for managing several, several tabs that can often use up a lot of processing power on even a Macbook Pro. I think the only challenge I've had with it is that the sleeping tab sometimes cannot recover what page it was on, so I get a "close tab" error that hampers my workflow. I've observed this when Firefox updates, but also sometimes seemingly at random, and possibly when the browser is reopened in general. Sometimes I can navigate backwards in the browser to get mostly back to where I was, but sometimes not. I use tabs to section off different parts of my work that occur at different times of the day, so they are almost never closed. I need them to help me remember a task I have to perform, but also to have everything at-hand if I have to interrupt my flow to jump to that tab group when not focusing on it. It would be ideal if the sleep mode was able to handle for this case more smoothly. Otherwise, it does exactly what's described. Thank you for making this extension.

Easy to use and It works, what else would you need?

I’m very happy to have discovered your extension (I found it because I was looking for a recently updated solution—most others haven’t been updated in over two years). I really like it, and so far it seems to be working perfectly. I’d be glad to help with the French translation if you’re interested, but I’m not sure how to contact you.