This is a Browser extension that automatically searches for your personal list of key words and highlights them in a colour of your choice.
The extension will search all the visible text on a website upon loading the page. You can enter any number of words to check for, even partial matches.
For example, if you enter the Word “tree” into the list, it will highlight the word “tree” everywhere it appears on the page. If you disable the function “Match whole words only”, it will also highlight the word “tree” anywhere it finds it, be it compound words or word endings. For example, it would then also highlight the word inside “treehouse” or “gumtree”.
This basically does the same as the manual search function via Ctrl+F, but it does this automatically upon loading a page and can be adjusted on the fly, both in search filters AND highlight colour.