After installing the extension, visit ChatGPT or Wikipedia. When you see a mathematical expression, right-click on it. You should see an option to copy either the LaTeX or Word/MathML data. Alternatively you can click on one of the icons next to where it says "ChatGPT" to copy a whole message with the equations (Word/MathML for this "multiline" option only works on Windows using a MS Word Extension). Now you can paste it into Word or your favorite TeX distribution. Have fun!