I switched to Firefox about six - seven years ago because virus attacks seemed to target IE and Firefox did a good job of blocking pop ups. I have also used Chrome. In the last three months three of my windows computers using firefox got infected with a Trojan that I tried and tried to get out, buying two supposed removal AdAware and Norton, neither of which got rid of it. I tried googling ways to remove and the cure was too much for me. I was not sure if the cure posted was legit or not. I removed Firefox from all three computers and now no more Trojan. Or at least winpatrol has not spotted it trying to call home.
Besides this I bought a Mac Book Pro about 4 months ago and have 90% switched to using it and not my windows boxes.
I am very careful what I click on so not sure how Trojan got installed. But it absolutely was related to Firefox.
Calling Firefox a poor man's Chrome does not make sense, both cost nothing?