The feature of capturing a screenshot of the tab before suspending is unique and very helpful, it's the reason that I use this extension instead of other tab suspension extensions!
Features that I'd love to see are context menu and a disable option with a blacklist for domains that I want to keep getting suspended.

If you want a tab suspender add on for Firefox, use this one. Every other suspender available for this browser seems to not understand that tabs can play audio and designing your suspender to automatically load a page because it was selected for any reason means this audio will start playing.

This one lets you choose to load a page with a click. Its so simple but its so nice not having to go back through my tabs to find the one that just loaded because I used a hotkey to close a tab I needed for just a moment and started blasting audio.