[Feature] Toggable Stylesheets for pages

[xstable]

I would love to have a feature to be able to "toggle" a part of the stylesheets with a switch.

Why?

In some Pages you see Listings... let's assume a Job-Listing Page for freelancers, which contain ads, and job offers.
Some of the entries might have special flags like owner based Project or Recruiter.

It would be awesome, if I could have (at least) one section which is toggable via a switch.
In that case, I coud do stuff like:

div.recruiter { display:none;)

With this functionality I could see any entries if I like, but I also could - and that would be a huge benefit - only show all "owner based" Project entries.

Perfect implementation would be to be able to add those "switchable css-section" dynamically, so that we can add (and activate / deactivate) as many css-sections in stylebot as we want.