Safari plug-in which prevents Flash objects from launching automatically on web sites (as they don’t appear on a customisable whitelist) and replaces them with a grey box. YouTube videos can be played in HTML5/QuickTime instead of Flash so the file is loaded in a format which reduces the processor usage of the Mac.
Changes your own IP address whilst you are surfing the internet; the Firefox add-on interrupts the FRITZ! Box's connection to the internet and then reestablishes it; displays the IP address in the status bar. Fast and secure download from The H