[PLUG] Optimizer?

[Denis Heidtmann]

While browsing, a message appeared, unannounced, uninvited, and persistent.  I
mentioned this once before on this board, but was not quick enough to capture
the details.  Now I have details.

The first window to appear:

The page at http://performanceoptimizer.com says:
NOTICE: Errors in you PC can cause data loss, hardware or software failure and
performance fall.
Install PerformanceOptimizer to fix errors, monitor changes and maintain PC
stability!

And so it goes through 3 windows.

To the best of my knowledge I did not click on anything in the page I was 
viewing.  Are these windows the result of Java script or Java?  Closing Firefox 
seems to be the best way to get rid of them, but that is a pita.

I did have a number of cookies from PerformanceOptimizer--I just deleted them. 
And I prohibited cookies from http://performanceoptimizer.com.  Will it put an 
end to this?

Is the site I am visiting when these windows show up responsible?

I have done some searching for this, but almost all hits deal with Windows, and 
are mostly old.

Any information would be appreciated.

Thanks,
-Denis