I just installed this.
From their page:
WebWasher® consists of three functional modules:

content filtering
privacy protection
access control
Content Filtering

WebWasher's standard filters prevent unwanted data objects on Web pages from being loaded. The following configurable functions are available:
Dimension filter
Filters unwanted advertising banners. New sizes can be added at any time.

URL filter
Activates WebWasher's integrated URL filter. You can add new objects for other URLs at any time by mouse click.

Pop-up windows
Eliminates any pop-up windows contained on Web pages.

Scripts
Suppresses the execution of scripts that are executed when Web pages are loaded or closed.

Animations
Animated graphics can be entirely eliminated. Alternatively, you can specify the number of repetitions of an animation or that only the first picture should be displayed.

Options
Removed graphics can be replaced with your own image.
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