|Thank you so much, really appreciated.Will keep a copy of the link ,excellent to have reliable links.|
Fingers crossed may have sussed it,Everything held last 24 hours.
Did a restore back to November then disabled all Add ons,then uninstalled FF again also the plugin add on that was not holding.
Will now introduce replacement other add ons one by one, to ensure that they were not faulty.
As a thought I was running 'Sandboxie' and 'WOT' I deleted disabled both of these again will re introduce them singly and check.
Wonder if they were the cause,
have you any comments on the the use of those last two???