My Firefox has suddenly gone anti-imperialist and pro-metric!
Whenever an email or text has an imperial measurement it adds a bracket with the equivalent metric data therein.
Its even started to do this..
1st. ie first (1stone = 6.36Kg)
This is not a premature April Fool!
I have progressively turned off add-ins but that doesn't do it.
I have Firefox 18.02