Would be a 5 if there was a shortcut to suspend all other tabs.
Works out of the box
Dev- please put in about:addons description to CLICK the toolbar icon to access the options or suspend other tabs.
Suspend other tabs adds snapshot and overlay to ALL other tabs including already unloaded ones. So you can preview every tab without having to wait for it to load.
Loading preview and the page itself are instant - I presume from FF cache without refreshing. ✔
Oops reload local text files doesn't work - but great backstop, just copy the URL from the overlay and paste in the address bar

why you need access to all sites data?

This addon is almost perfect and is exactly what I have been looking for.

But what is up with the huge link in the address bar when you suspend tabs?

If I want to simply copy and paste the link from the address bar to my notepad or something, it's HUGE! The links are SO LONG. Why?

Look at this example:

moz-extension://04-a289-4c3e-8ede-0a1342c48/src/suspended/suspended.html?url=https%3A%2F%2Fexample.com%2F%3Fde%3Ddirect&tia%20%7C%20Benchmark%20%26%20Compare%20the%20Best%20AI%20Models&prefix=%F0%9F%92%A4%20&favicon=data%3Aimage%2Fsvg%2Bxml%3Bbase64%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%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%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

I couldn't even paste the whole thing here because it went over Mozilla's character count.

It's not cool, man!