Is Safari hotter than Firefox on MacBook Air 2GB?

Will Safari make my MacBook Air - 2GB, mid 2009 - run hotter than Firefox?

CPU temp of 133?
Hopefully that reading is in Fahrenheit so I'll need to change my Preferences in iStat as I normally work in Celsius
These readings are from a 2011 MBA with a 1.7GHz i5 Processor and 4GB Memory so we are not comparing appples with oranges but it will give you a ballpark figure.  Software is Lion (10.7.3)
Running Photoshop my CPU temp varies between 80 to 100 degrees F with the 'Enclosure' temps in the mid 70's.
To comment on your original question...
Regardless of whether I use Safari, Firefox or Chrome my CPU stays between 90 and 100 degrees F.

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