it is not a hopeless situation. I, actually, had been following the development of 2.1, and had created a separate profile. I was not interested in excotic Themes, or Roboform, but had some incompatible extentions.
So, I relied on Nightly Tester Tools
, checking the Force Addon Compatibility line.
I had two incompatible extentions. One was IE Tab Plus, which did not show up, and the other was the Prefbar, which did. There was no visible Home button, using the Toy Factory Theme., but I found out the the first button to the left of the Bookmarks Toolbar was blank, but active, so why bother with blah Themes. The IE Tab Plus button came to life came to life by Customizing the Menu Bar. The Search button was invisible, but, again, I got it by drag and drop from the Customize list. So far, so good.
I have not removed 2.0.14, in case the use of a foreign version with an old version may mess it up.
UserAgent: Mozilla/5.0 (Windows NT 5.1; rv:2.0.1) Gecko/20110608 Firefox/4.0.1 SeaMonkey/2.1