Yes! Just Use Ctrl+Shift+K in Firefox or Ctrl+Shift+I in Chrome.
Then at the topleft there is an arrow(firefox) or magnifier(chrome). Click on it and hover over the desired element (form field) then click on that. The Inspector should now shows you the code of form element like:
<input type="number(Or STH)" name="STH" value="STH" />
The value="" is the important part. double click on it and enter information between " and " . Then close the inspector and send the form using regular submit button.
Note: If there is not a value option you should add it by RightClicking on it and choose Edit as HTML
then add value=""
and other stuff ....
CHEERS! And Shame on that nooooooob webmaster ....
1Contact the webmaster. – Xavierjazz – 2014-09-24T19:43:33.467
2disable javascript in your browser – heavyd – 2014-09-24T19:43:53.730