what is it that The Marvelous Suspender does that you’re finding useful?
Check out this discussion thread at Github, and you will get a sense of why so many want to keep The Marvellous Suspender alive, and why none of the available alternatives substitute for it:
If Brave can provide a lifeline for the developer, @gioxx – i.e, by extending the life of TMS beyond the final deprecation date (expected sometime this month) as it’s doing with other extensions – the developer may be able to find the level of collaboration he needs to update it for V3. (Maybe he’ll even find it here!.. Non si sa mai.)
In my case, as a non-developer general user, I like the greater control TMS gives the user over suspension as well as some specific features, such as making backing up all windows & tabs to an html document a cinch that can be done with a single click within the extension.
And not least of all, there is a consistent consensus of trust in this developer, also evident in the thread.