problems with Firefox and Safari (Mac)

Hi, I’m experiencing some problems using the plug-in with Firefox and Safari on a Mac.

Firefox: when I click on “Play” or “Stop” it pops up a window to download the video.

Safari: when I click on “Play” the video results not found and it starts download on the hard disk.

Please, can you help me with these issues, I would only6 need the video to normally start as it happen on Chrome?
Thank you