Privacy Badger 是一個自動學習的 extension，可以學習 tracker 並且予以阻擋：
Privacy Badger automatically learns to block invisible trackers.
而這個自動學習功能在剛剛看到公告說明預設會關閉：「Privacy Badger Is Changing to Protect You Better」，主要是因為這個自動學習功能可以變成 fingerprint 資訊的一環：
The team also alerted us to a class of attacks that were enabled by Privacy Badger’s learning. Essentially, since Privacy Badger adapts its behavior based on the way that sites you visit behave, a dedicated attacker could manipulate the way Privacy Badger acts: what it blocks and what it allows. In theory, this can be used to identify users (a form of fingerprinting) or to extract some kinds of information from the pages they visit. This is similar to the set of vulnerabilities that Safari’s Intelligent Tracking Prevention feature disclosed and patched late last year.
所以現在變成會固定更新 pre-train ruleset 了：
From now on, Privacy Badger will rely solely on its “Badger Sett” pre-trained list of tracking domains to perform blocking by default. Furthermore, Privacy Badger’s tracker database will be refreshed periodically with the latest pre-trained definitions. This means, moving forward, all Privacy Badgers will default to relying on the same learned list of trackers for blocking.
當然這個功能還是可以手動開，但就有可能會被拿去 fingerprint 了，要開的人可以自己想一下... 不過不開的話就只是一個 ruleset 了 XD
有用的人可以自己考慮一下 XD
