title: How to make permanent changes to a website's CSS from within the browser?
body: <p>If I am trying to edit some <code>CSS</code> in a huge project using the <em>built-in</em> <em>developer tools</em> in Firefox (which is accessed by right click and then selecting <em>Inspect Element</em>), is there a way to make those changes permanent?</p>
  
  <p>Actually there is a big number of style sheets and and I could not locate this one property in them? I just could not find the file which contains this property, so I want to make permanent changes to the CSS from within the browser. Is there a way?</p>
  
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  <p>EDIT:-
  <img src="https://i.stack.imgur.com/W5XWQ.png" alt="enter image description here"></p>