On <http://portableapps.com/news/2012-11-20--firefox-portable-esr-10.0.11-released> you said that you "will switch the Firefox Portable ESR build to 17.0.1 from 10.0.11 and likely skip 10.0.12"
Please continue to support Firefox 10.0.x ESR as long as possible, while you still create corresponding Thunderbird 10.0.x ESR versions. Rationale: This is the last secure Firefox branch still working under Windows 2000, and it is certainly better than IE6 ;-)
The suggested in-place upgrade from a portable 10.0.11 ESR to 10.0.12 ESR worked as expected, but apparently left a later unused temporary profile on the local harddisk (deep under c:\users\... on windows 7.)
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