From Firefox Support.
To open the
about:config page, type
about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access the
You have to create a new Boolean pref via the right-click context menu with the name
browser.download.lastDir.savePerSite and set the value to false.
Use the Search (Filter) bar at the top of the
about:config page to locate preferences more easily.
Preferences that have been modified show as bold (user set).
Preferences can be reset to the default via the right-click context menu if they are user set
Preferences can be changed via the right-click context menu: Modify (String or Integer) or Toggle (Boolean) or by double-clicking the line with the pref
browser.download.lastDir.savePerSite controls whether the directory preselected in the file picker for saving a file download is being remembered on a per-website (host) base. If set to true, the data is stored as content preference.
Default value: true
Exists by default: no
Application support: Firefox 11.0
Status: Active; last updated 2012-02-15
Introduction: Pushed to Nightly on 2011-12-11
Bugs: bug 702748
The last used directory for the website (host) serving the file for download will be preselected in the file picker. If no download directory for the current website has been stored,
browser.download.lastDir will be used.
The last used directory for any download (stored in
browser.download.lastDir) will be the preselected directory in the file picker.