Originally Posted by Theodoric

Well, I don't intend to tempt fate and try to remove the alleged earlier versions that are probably no longer there! Let sleeping dogs lie. On the other hand, if they are remnants only, then I suppose delving into the bit of the Registry that keeps the Installation info might solve it.
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And following my own advice and searching for Mozilla in the Registry seems to produce a separate little folder for each version, the info in each of which seems very similar. In other words, would removing the bits referring to the earlier versions solve the problem.

On the other hand, sentences including "fools", "angels" and "treading" keep passing through my mind.