Extension doesn't work correctly due to multiple issues:
1) BUG - displays an error message from Firefox when using the "Save Page To" option: "e.tabs.captureVisibleTab is not a function".
2) BUG - "Regenerate Thumbnails" option doesn't work either singly or in batch mode.
3) There's no point reporting a support ticket as there is no response suggesting the software is no longer supported.