How to find a code file by inspecting an element by the browser?

Question

Browsers

Here courses.vashaispania.ru has a drop-down list for sorting by price, name, etc. I need to edit it, for example, remove some of the items. Is it possible to find the name of the desired file using Firefox's "Inspect Element" feature? I see the text of the file with the necessary lines, I see the styles with the names of the files. But where is the name of the desired file?