Sorry, I'm not sure is that preference is still working in Firefox 29. I relocate my entire Profile folder to the D: drive, so that the Cache and other files that would normally be in the ~\User\Local Settings\Application Data\Mozilla\Firefox\Profiles file path end up in the Profile folder on the D: drive.

The only way to change the temp location is to change the %TMP% and %TEMP% environment variables in the Windows System settings.

Note that some settings might not work in a folder at the root level (D:\) and you may have to create a sub folder and specify that folder (make sure that the specified folder exists) if you use browser.cache.disk.parent_directory

This pref should still be working.

• http://mxr.mozilla.org/mozilla-release/source/netwerk/cache/nsCacheService.cpp

You may have to delete the previously used cache location as found on the about:cache page with the browser.cache.disk.parent_directory not being used.

I like this idea but how do I relocate the profiles folder to D:/. Peter

You can use the Profile Manager to create a new profile and use the Choose Folder button to specify a location on the D drive. Make sure to specify a new and empty folder because Firefox will use the specified location and doesn't create a new folder in it.

• http://kb.mozillazine.org/Profile_Manager
• https://support.mozilla.org/kb/Managing+profiles