Switch to the HTML tab, on the right side should be the style pane (left HTML), 
right click in the style pane in an empty space (ie not directly on a rule name 
or property/value) and select "add rule"

Regards,
JP Charrier

> On 21/05/2015, at 9:04 pm, 'Ben' via Firebug <[email protected]> wrote:
> 
> @Sebastian Zartner:
> 
> your suggestion is NOT working.
> Have look at the attached snapshot for a simplified example web page.
> .
> There I tried to add in the "CSS Panel" on the right side a NEW CSS 
> instruction which should be applied ON TOP of the existing CSS styleshet.
> But it is NOT accepted by Firebug.
> 
> 
> 
> 
> Again: I don't want to directly edit the CSS on the left side but add a new 
> CSS on top of an existing.
> 
> Any other suggestion?
> 
>> On Saturday, 14 March 2015 17:52:34 UTC+1, Sebastian Zartner wrote:
>> To edit the CSS of the page (temporarily) you should use the CSS panel or 
>> the Style side panel within the HTML panel.
>> 
>> Sebastian
>> 
>>> On Saturday, March 14, 2015 at 2:26:07 PM UTC+1, Ben wrote:
>>> Assume I loaded a web page with CSS stylesheet in Firefox.
>>> 
>>> Now I want to add another CSS statement on top of the existing CSS 
>>> stylesheet.
>>> 
>>> The existing CSS stylesheet should neither be changed nor edited in place.
>>> 
>>> Instead I want to add a statement e.g. with the "!important" appendix e.g.
>>> 
>>>    #print-wrapper div { font-size: 12px !important; line-height: 14px 
>>> !important; }
>>> 
>>> Ok, I could enter such a CSS statement in Firebug console.
>>> but how can I really add it?
>>> 
>>> Hitting "Run" results in an error statement
>>> 
>>> Ben
> 
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