This is more of a suggestion / feature request than an issue report but...
I had a issue with the extension seemingly not working and I spent quite some time figuring out why. Fortunately I stumbled upon your explanation of how to pause it using CapsLock...
Believe it or not, but I sometimes actually use CapsLock for its main purpose, hence the issue. Would it be possible to remap the extension pause to something else? I saw you yourself mentioned ScrollLock somewhere.
In an ideal world it might even become a configurable shortcut, but I guess this is more work...
BTW. Thanks for the great extension :D