https://goo.gl/7ym03n Multi-highlight

Multi-highlight
Highlight multiple words in web pages.
Can do for you:
 - Highlight multiple english words (whole matching).
 - Store the highlight words list locally.
 - Re-do highlighting automatically when page content changed.
In coming features:
 - Add a context menu button, to add selected word on page.
 - Shortcuts.
 - Phrase support.
 - Add a setting/option page, to set whole word matching or not.
 - Configurable highlight style.
 - Make it faster.


https://goo.gl/7ym03n