Browser extensions developed by whochan/FAR/RAKUDA and this website never collect any personal identifiable data about their users. These extensions saves users preference settings into the local storage on a browser running them. If a user want, their data are saved into the cloud space of their account provided by the browser bender.
Some extensions uses XmlHttpRequest to download any Web resources (e.g. adblockocking rules) in their background process. Otherwise, XHR is used to load local extension's files.