SafariButtons 

SafariButtons 0.4.2 replaces the Bug button in the Safari toolbar with a New Tab button and adds a simple key combination to remove images for faster page loading.
safari extension new tab

Just Watching 

Imagine that you could continuously monitor multiple online images without having to open your browser! Use Just Watching to build a custom wallpaper that can display web cams, stock charts, weather maps and home security cams right on your desktop!
just watching just web cams cams images web graphics desktop wallpaper live charts weather charts stock