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How can I capture network traffic of a single process?

I want to write a script which start/resume downloading big file using a download manager say wget only if the browser [say firefox] is not loading anything [actively not using internet].

How can i check from a script whether a process actively using internet or not ?

ss -p will give the connected process but can't say wheter they are active or not

nethogs is a visual solution but i can't use it in script due to its dynamic nature

marked as duplicate by gertvdijk, stephenmyall, Jorge Castro, qbi, ajmitch Jan 24 '13 at 20:22

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