Flashplayer plugin doesn't work without an internet connection with firefox browser

A few useful data points would be helpful:

• What's the full URL that's being requested?
• Are you getting Flash Player's slow script dialog, or FIrefox's?
• Is tshe issue specific to Firefox?
• Have you confirmed that the application works as expected when Flash Player can make the expected netowrk connections?

My guess is that you're conflating network traffic that's coming from Flash Player's auto-update process with traffic generated by Flash Player itself, and that it's unrelated to the problem that you're experiencing.  Either that, or the content depends on a shared library that's hosted on adobe.com, like the Flex framework, which is commonly used in enterprise Flash applications.  The full URL should make that topic very clear.

If it's firefox specific, go to about:crashes and submit the relevant reports.  If you give me links to them, I'd be happy to take a look.  In general, there's a long-standing class of IPC hangs between Flash and Firefox that are solved by moving to 64-bit Firefox, and this sounds a lot like that issue.

If the issue is happening in all browsers, my guess is that the content itself, when unable to connect to the server that it expects to, is retrying that connection in a tight loop.  Without the ability to step through the content in a Flash debugger (the author would need to do that), it's hard to give you a definitive answer.

You're also welcome to submit a bug with a reproducible example, here:

http://bugbase.adobe.com/

That would allow us to examine the behavior under a C++ debugger and determine the root-cause, but given that the behavior is entirely dependent on the firewall configuration, my suspicion is that it will ultimately come down to the content.