"...I cannot drag and drop tabs (the iconic graphic moves but disappears when released)..."

Drop the tab when the arrow appears pointing between 2 tabs as depicted here: http://support.mozilla.com/en-US/kb/Tabbed+browsing#Moving_tabs

"...also I cannot "select" tab for changing child/parent status etc."

If that question relates to Tree Style Tab, see: http://piro.sakura.ne.jp/xul/_treestyletab.html.en ~~red:or~~ http://piro.sakura.ne.jp/xul/_treestyletab.html.en#api

Please do not send links simply explaining how to drag and drop; it DOES NOT WORK. Are there any ideas as to how this feature can be restored?????

This a new installation on a new computer and has not worked from the inception. Would re installation have any effect or would it just prove the rule regarding insanity, ie. doing the same thing hoping for a different result.

Every system is different. The knowledge level of every user is different. It is very difficult to diagnose a problem "at a distance". We are all uncompensated volunteers here to help other users. Suggestions can be made based only on the information provided in the question.

Did you get the parent/child folder question resolved?

There could be some conflict with the 3 tab related Extensions that you have installed: Tab Mix Plus, Tree Style Tab, and Easy DragToGo (not familiar with this one, but I see it in a Google search).

Have you tried using Firefox Safe Mode?

Safe Mode You may need to use Diagnose Firefox issues using Troubleshoot Mode (click on "Safe Mode" and read) to localize the problem. Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes before starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.

See: Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems Troubleshoot and diagnose Firefox problems

If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling one at a time until the problem reappears. You MUST close and restart Firefox after EACH change via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.

hi there,

I had the same problem (unable to drag 'n drop) and it was restored when I disabled the "tab mix plus" addon.