Just wanted to chime in here with a great big "Thank You!". I've been using your plug-in this week and it's been great.
The amazing thing that prompted me to write this post was when I accidentally closed a tab. I hit cmd-z and cmd-shift-t, my two muscle memory commands to undo a closed tab (safari and chrome, respectively), but neither worked. But then I realized I had just been editing that tab and tried going "back". And it worked!
So, great plug-in. I encourage others to give it a try, and maybe jon to include similar functionality at some point (pretty please!).