I am working already for some years with the subject and Web Development would like to put you here just a couple of Firefox add-ons near, everyone should have web developers. Should you have other must-have add-ons for web developers know, write me a comment. I will test the add-on and then take back to the table.
You can find the font on a website totally awesome, do not know how they say and do not want to torment you but by the style sheet? Simply highlight text and font finder shows you a button, the font used