It has some issues yet, but has more features and already/{probably will be} more ergonomic than OneTab .

I just wish I could change keybinds or turn them off so I never accidentally hit them

This is a lifesaving extension -- it's transformed my approach to browsing. It's a little rough around the edges but generally very functional. An additional feature that would make a huge difference would be to have the ability to sort sessions you've set aside, either manually or automatically.

Its a fantastic and very useful add on. Something I was just looking for to put tabs in a side for future usage. I have a question about how can I add any tab in my previously stored session?
Example: I have stored 3 tabs in a session today. If tomorrow I have another 2 tabs related to same topic which I want to add in that previous session then how can I do that?
Currently, I have ended up with 2 different sessions of the tabs for the same topic.
Please help about it.

It´s great but I would like to be able to disable the "session actualization" feature so I can browse the tabs that I need from a session and close the ones that aren't useful at the moment without actually discarding them from the session.

One suggestion: 3-digit numbering - I just set aside a couple of hundred tabs (research delve) and the numbering loops at 99

What I was looking for is something that mimics the Edge tab set aside feature. This comes really close, but the one thing that keeps it from really shining in my opinion is the ability to open individual tabs that have been set aside. Otherwise, this is a really good start; thanks for making it!

Update 2017-12-20 for 1.13: Added a star (up to 4 now) for the ability to open individual tabs that have been set aside. I'll update to 5 stars if you allow for removing individual tabs from a set-aside group as well (so that if I have several tabs but want to set them aside and deal with them one-by-one that'll be easier), and as a nice-to-have, it would be great to be able to have an option to open and remove from the group at the same time (and maybe an option to make that the default behavior). It's coming along nicely, though, and with this update I can make it a bigger part of my workflow. Thanks!

Does what it says. There is however room for improvement. My suggestions:

A toggle which sets whether or not put aside bookmarks get closed. Sometimes you might want to save different sets of tabs with one or more of the same tab in each.

A second toggle on whether or not set aside bookmarks are deleted from the bookmarks when restored.

The ability to set the root location of the set aside bookmark folder. This would point to the folder above it to use (currently "Other Bookmarks"). One advantage of that is that you could point this is a folder on the Bookmarks toolbar.

Maybe the ability to rename the the sub-folder the set aside folders are saved to. Currently this is the name of the active tab. Maybe what would happen is that (like the old Tab Mix Plus) you'd get a popup with a text field defaulting to that, which you could edit, before saving or cancelling.

Just some ideas. Keep up the good work.