Steam Inventory Helper can do exactly that. The only thing is it's probably against Steam's terms of service, so you might be punished for using it. It's for Chrome but there's a Lite version for Firefox, too. Check the link for the details.
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I'm hoping someone knows of a script/addon/application that does what the title says. I tried searching and the closest thing that I found was this: http://www.steamgifts.com/forum/3goRG/userscript-to-add-sell-buy-orders-to-inventory-and-quick-sell-buttons-firefoxchrome but I don't think that does exactly what I've asked for.
Does something like this exist?
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