Dear Shane Gowland,
In answer to your question about where Group Speed Dial is storing its data, Here are two locations that I could find:
chrome://extensions/?id=imfeikbeimbfpmgfkkmjekabdehiiajc
AppData\Local\Google\Chrome\User Data\Default\Extensions\imfeikbeimbfpmgfkkmjekabdehiiajc\18.3_0\png\domains\chrome_extensions.svg
Hope this helps!