Muscle Memory collects nothing, sends nothing, and has no server to send it to.
Two things, both on your own machine, both through the browser's extension storage:
chrome.storage.sync, so they follow your
Chrome profile between machines the way your bookmarks do.chrome.storage.local: how many times the
extension pressed a shortcut on your behalf, how many of those Figma
acted on, and the name of the last one. That name comes from a fixed
list of four written in the source, so it can never contain anything you
typed. This is what the diagnostics panel reports.
One permission, storage, for the settings above. Site access is
limited to www.figma.com and nothing else: no
<all_urls>, no other domain. Chrome describes that access
as "read and change your data on figma.com", which is what any
extension that touches a page has to ask for. What it does with it is read
keyboard and mouse events, and the wording of banners.
"Reset everything" in the options page clears the settings. Uninstalling the extension removes both stores entirely. There is no copy anywhere else.
The extension has no build step: the source on
GitHub is byte for
byte what runs in your browser. Searching it for fetch,
XMLHttpRequest or WebSocket returns nothing.
Muscle Memory is not affiliated with Figma, Inc.
Questions: open an issue.