I use the upgraded firefox with ANZ on both the laptop and PC and have never had a drama

Same, tech support is full of BS.

you could try clearing your cache, never hurts and is easy to do.

Just go to Edit
preferences
Privacy
Private Data should be last on the list and say something like always ask me before clearing my data. and click on the clear now tab.
If you do this you will lose any saved passwords on your pc.
Just so you know