I finally got rid of Firefox completely, and the funny thing it was more luck as i was not trying to do this.
I was playing with the new LMDX, unistalled (through synaptic) firefox and iceweasel got installed in its position.
Then, i installed opera (my favourite browser).
Afterwards, i read that post, back to synaptic, check iceweasel for completely remove and midori for installation (i was planning also to give it a try -two birds in a stone).
Mint meta debian was also been removed.
As i said, it was more luck than anything else. Some steps are most probably unnecessary, but as you can see there is an easy solution.
Sid Mint Xfce -32, Openbox, KDE, Enlightenment, Liquorix Kernel
HP Compaq Presario cq71, Intel Core 2 Duo T4400 @ 2.2 GHz, 3 GB DDR2 RAM, Nvidia Geforce G 103M