Web Application

I have to build a web extension for a project. The project involves searching for particular keywords within a web page. For this, the keyword needs to be taken as input from the server and then it needs to be highlighted within the webpage everytime it occurs. The input provided to the extension goes to the web server and there it is linked to some other keyword. That keyword needs to be displayed.
Eg - If I enter input as Money and money is linked to the keyword say, Dollar, then every instance of dollar needs to be highlighted in the given web page.

Can someone guide me step by step as to how to proceed.

I only know the basics of Javascript and HTML. If anyone could provide me as to how to proceed further and what all would be required to make this extension. I have to make it for Google Chrome.

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