Clear Flash Cookies in Firefox

Luckily Firefox's great extension support makes it really simple to get rid of those awful Flash cookies with the previously mentioned Objection extension. You'll have to download the development release and use an about:config hack to make it compatible with the latest versions of Firefox, but once you've done that, installed the extension, and rebooted Firefox, you should be able to head into the settings to make short work of those Flash cookies.

The Settings tab gives you an option to automatically remove the Local Shared Objects on browser open or close, the File details tab will allow you to take a look through all of the local cookies already stored, and the Flash player settings tab gives you access to a bunch of options, including telling Flash to never store information.

I haven't tried this extension yet, but will soon...