Persistent Highlighter is a Chrome add-on developed by n8chz. It is a free program that falls under the category of browsers, specifically add-ons and tools. This add-on is a watered-down port of Prostetnic Highlighter, offering basic yet useful features.

The main function of Persistent Highlighter is to highlight text on web pages. It allows users to select and highlight specific passages of text, making it easier to remember or refer back to important information. Additionally, the add-on stores the URL and the highlighted text as a key-value pair in the local storage of the browser.

One of the notable features of Persistent Highlighter is its ability to re-highlight text passages when revisiting a URL. This ensures that the previously highlighted text remains visible and easily accessible. Moreover, the add-on allows users to search for previous highlights by word, making it convenient to find specific information within a page.

However, it's important to note that Persistent Highlighter may not work on certain websites, such as Disqus comments, and the developer is actively working on resolving this issue. Overall, Persistent Highlighter is a useful tool for text highlighting and storage, providing a convenient way to mark and revisit important information while browsing the web.