How can I search a text in some website (not from the source) with Python?

I want to make an "autofill" that works like this:

The site contains the Name and down the Name has the field to write it.

So, I want to make a program the search the "Name" in the website, and before that, click down the "Name" and write the name (easy part)...

How can I search for it?

I can't use the site forms, because, everysite开发者_开发百科 has different forms

Try: Automate firefox with python? and https://addons.mozilla.org/en-US/firefox/addon/7620