Hi there,
This is Shamzi here. Hope you are doing well.
I'm a passionate web applications and Chrome extension developer, with over 6+ years of experience in the field.
I read through your project requirements here and would like to work with you to develop the extension which can scan through the page HTML and find out words/phrases/sentences.
We can do this via JQUERY and native JavaScript, no need of any other third-party library for this.
With the amount of chrome extensions I have developed in my work career, I have gained enough knowledge to implement such extensions.
You can checkout some sample work which I have done on my freelancer profile page .
Just ping me on chat and we can discuss this further and start the project asap.
Cheers,
Shamzi