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I checked about:config, but I didn't find anything related to the temporary folder.

By default, when you choose to open a file instead of save it, it would download the file to `/tmp', and open it when completed, now I'd like to pick another location.

Already tried to add browser.cache.disk.parent_directory, but that doesn't seem to work for 16.0.2

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Hello warl0ck, Did you use the string "browser.cache.disk.parent_directory"..? in the about:config – Waffle's Crazy Peanut Nov 16 '12 at 1:55
@CrazyBuddy Hmm, I don't have that entry, only some "size" or "enable" stuff – warl0ck Nov 16 '12 at 2:05
@CrazyBuddy let me see if it works by creating one – warl0ck Nov 16 '12 at 2:06
Yes, it works if you create a new string... – Waffle's Crazy Peanut Nov 16 '12 at 2:06
Have you checked whether the string "browser.cache.disk.enable" is true? – Waffle's Crazy Peanut Nov 16 '12 at 2:10
up vote 1 down vote accepted

Create a new preference browser.cache.disk.parent_directory in about:config and use the value <Location> indicating the location you required. Then, make sure that you've toggled the browser.cache.disk.enable to TRUE value.

Hope that helps...

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