A rule-based content filter inside your browser.
The rules are taken from e2guardian: It has a number of key words, which it tries to find on the web page. For each word found, a score is incremented. If a certain limit is passed, the page is blocked.
You can set values via managed storage administratively. You can customize the block page. See https://www.patreon.com/posts/web-content-1-3-20710067.