How to write a plugin or extension for a browser to search for a phone on a page?

Question

JavaScript

Task: search on the page for all phone numbers and check these numbers in the MySQL database on the server. That is, all the numbers that are on the page must be painted in certain colors, depending on certain conditions.
Tell me, are there any ready-made solutions for this task or with what tools can I solve it?

Answer 1

I don't know about SQL, but coloring is not a problem. Look for tutorials on writing plugins for Chrome, I came across something similar. In fact, you need to insert your js + css into the page.
The numbers themselves can be requested via AJAX from the web server.