As a security precaution, Firefox, by default, only allows you to download/install extensions and themes from the secure Mozilla addon website. When you attempt to download such from other sites, you should receive a yellow bar at the top of your screen explaining the installation was blocked for your protection, along with an 'edit options' button. Click the button and allow www.spoofstick.com.
Another option is to go tools->option->content and uncheck the box next to "warn me when websites try to install extensions or themes." Go back to the website and try downloading again. Note: Make sure you recheck the box after you're done.
The final solution is to type in about:config in the address bar, scroll down to the bottom and look for xpinstall.enabled. If the value is set to false, double-click it to reset it to true, then try downloading spoofstick again.
Hope this helps,
Has anyone else had problems downloading Spoofstick on Firefox.
There were no problems downloading on to IE but on Firefox when I click the download button within seconds it justs says 'done' but nothing has happpened.