There's a thread on enwiki about what looks to be plausible threat of a targeted attack on the privacy of wikipedia editors. Some quotes from the referenced slide show:

• Identify and target Wikipedia editors abusing their position by analyzing text patterns, usernames, and technical data through data breach analysis, fingerprinting, HUMINT, and technical targeting.
• Use redirects to capture IP addresses, browser fingerprints, and device data through a combination of in browser fingerprinting scripts and HTML5 canvas techniques

I don't know how serious a threat this is, or whether there is anything that can be done at our end, so opening this ticket just to make sure T&S is aware of it.