I could use a small help

Hi everyone, I wasn't sure which sub to post this one, and this one seemed most fitting.

Basically, I am no engineer nor do I aspire to be one and I just need help/advice.

I'm looking to find a simple app, or have someone build it if it doesn't exist.

I would need an app/browser extension that would mark certain text on a webpage (basically CTRL+F) and indicate in some way if it's found or not (ie. redlight/greenlight). This would need to work constantly through refreshes and different pages (with no interaction, CTRL+F needs interaction with every new page).

User should be occupied with other tasks on the same PC and should just take a glance and know if there is said text on the page or not.

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Could you let me know if you know if something like this exists, or where to look for someone to build it, which language developer?