Dumping Mozilla for Firefox,Thuderbird combo

I decide to stop using Mozilla in favour of Firefox, Thuderbird combo.
Firefox is a stand alone browser, and Thuderbird is stand alone email client, both made by Mozilla foundation.
I make this decision since Mozilla package isn’t as current as neither Firefox, or Thuderbird, and I think I raed that Mozilla foundation will favour Firefox/Thuderbird.
Another advantage of two seperate programs for browsing and email, is the ability to upgrade one component without affecting the other, althought all Mozilla upgrade were very smooth.