Lemmy Tagger does not collect any personal information, and does not share any information with third parties. It needs permission to examine each web page you load, but it only uses this to ascertain whether the site is a Lemmy site. If the site isn't a Lemmy site, the extension quits. If it is a Lemmy site, it inserts tags into the page. Lemmy Tagger does not watch what you are doing on Lemmy or any other site, and doesn't record your browsing history.