I want to know if there is any service or add-on available for firefox to compress the incoming data like opera browser.
Short: There isn't any.
Long: Opera's Turbo works by sending the request to Opera's webservers, which get the data in uncompressed format, even if the webserver sends the data in compressed manner( eg: Stack Exchange sites), compress these and send it back to the browser. Theoretically, it's possible to simulate this via an addon but it's trivial for Opera to block these, and it wouldn't look good.
Perhaps something which you can roll out yourself if you're so inclined
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