Really simple, small and useful addon.
It do exactly needed without any suspicious extra-permissions.

two feature requests here:
1. Manual tab restore:
it would be really usefull to add option that tabs can be restored manually only (without automatic restore right after switch to the suspended tab)

let's say, by click inside suspended tab on some special link/area

2. suspended tab preview
additionally for 1st FR it would be helpful to have some small screenshot-preview of suspended tab in this case.
but at least site URL and tab name may be enough.

and one more time, thank you for this addon.