How can you add a new rule in the inspector?

I've grown very accustomed to the Chrome developer tools, and I've recently decided to try out Firefox.
Best I can tell, you cannot add custom rules in the Firefox inspector tab. For instance, if I inspect the element on an image in Firefox, I am given all the defined styles (rules) for that element. I can, of course, edit those defined styles. However, it does not give me an option to add my own custom styles unless I jump over to the 'Style Editor' tab and write them in manually. This becomes a problem when I want to write in a quick :hover or a :first-child or reference any other selecter that's not already defined.
In Chrome, not only do I add/remove/change styles directly in the Inspector, but it also saves a custom inspector stylesheet for me with all the changes I made.
Chrome example: http://cl.ly/Wm56
Firefox example: http://cl.ly/WmUP
Is there any way to add custom styles directly from the inspector tab in Firefox?
Thanks!

You will notice an element {} item at the top of the Rules list in the right plane.
You can click between the curly brackets {} to enter a new inline rule for this element.
You can do this within other rules {} as well.
Type the colon to separate the property name and value.
That is easier than adding a style attribute in the left pane or editing a style sheet file.
That should work as well as rules added this way show as a style rule.
*https://developer.mozilla.org/Tools/Page_Inspector

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