# Firefox & Thunderbird App Data Directory

**URL:** <https://boards.straightdope.com/t/firefox-thunderbird-app-data-directory/444665>\
**Category:** Factual Questions\
**Created:** [April 9, 2008, 9:11pm UTC](https://boards.straightdope.com/t/firefox-thunderbird-app-data-directory/444665 "2008-04-09T21:11:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Will\_Repair](https://avatars.discourse-cdn.com/v4/letter/w/a698b9/32.png) [@Will\_Repair](https://boards.straightdope.com/u/Will_Repair)\
**Post date:** [April 9, 2008, 9:11pm UTC](https://boards.straightdope.com/t/firefox-thunderbird-app-data-directory/444665/1 "2008-04-09T21:11:03Z")

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How do I change the default directories which FireFox and Thunderbird use to keep data in Windows XP? I want to install the two apps onto a flash drive to use at the public library computers but I also want any data to also be keep on the flash drive. And not in C:\Documents and Settings…

I want to change the use of C:\Documents and Settings…\Application Data to FlashDrive:\Data.

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**Author:** ![hekk](https://avatars.discourse-cdn.com/v4/letter/h/50afbb/32.png) [@hekk](https://boards.straightdope.com/u/hekk)\
**Post date:** [April 9, 2008, 9:38pm UTC](https://boards.straightdope.com/t/firefox-thunderbird-app-data-directory/444665/2 "2008-04-09T21:38:31Z")

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There are “portable” versions of both FireFox and Thunderbird out [there](http://portableapps.com/apps/internet/firefox_portable) that do exactly what you need. I believe that transfering your email and bookmarks to the flash drive versions is a cinch.