I have done as you asked and I found that Version 2.6.6 works for rc1, rc2, rc3 and rc4 but fails on rc5.
Using ctrl,shift,J gave an error message on rc5 stating
Error: gBrowser.addProgressListener was called with a second argument, which is not supported. See bug 608628.
Source File: chrome://browser/content/tabbrowser.xml
Line: 1880.
I trust that this means more to you than it does to me.
Previous versions gave lots of Warnings but not " X Error" messages.
Thanks for help so far
Using ctrl,shift,J gave an error message on rc5 stating
Error: gBrowser.addProgressListener was called with a second argument, which is not supported. See bug 608628.
Source File: chrome://browser/content/tabbrowser.xml
Line: 1880.
I trust that this means more to you than it does to me.
Previous versions gave lots of Warnings but not " X Error" messages.
Thanks for help so far