I'm pretty sure it's a chain. The 2007-on Tribute has a 2.3L MRZ engine which it shares with the mazda3 mazda5 and mazda6. And I know for a fact that the mazda5 has a chain.
What are the timing marks for 2.3 2007 mazda 6
It must have a timing CHAIN(s) The Gates website does not list a timing beltfor the 2.0 or 2.3 liter 4 cylinder engines in a 2007 Mazda 3
All 2002-2008 Mazda 6 petrol engines are chain driven, only diesels have timing belt.
belt
Does a 2007 Nissan Sentra have a timing belt or timing chain?
Timing Chain
timing CHAIN
It uses a timing chain.
It has a timing chain.
Chain
I have nissan primastar 1.9 Dci 115 2007 and this has a timing chain
It uses a timing chain.