Description from extension meta
OpenHighlighter is a source available tool that quickly auto-highlights multiple custom search terms or phrases on any webpage.
Image from store
Description from store
● Enter your search terms (one per line) in the popup.
● Instantly highlight all matches on the current page.
● Optionally, enable automatic highlighting on every page you visit.
● Your search terms and settings are saved locally and never leave your browser.
● Source available and supported on GitHub.
https://github.com/abaines/search-extension