All the browsers have this zooming in/out capabilities which enlarges/shrink the fonts using control-mouse-scroll - which is almost universal already ( haven't found any browsers which do not do that !!! ).
And all the browsers retain their zooming factors ( and font sizes ) for subsequent use - iceweasel 3.5.X inclusive !
With the newer versions ( tested 6.0.2 and 7.0.1 ), iceweasel is becoming the only browser which does not retain the zooming factors anymore. After zooming in/out on a particular page, the next click brings the display back to the original zooming factor ( and font size ). End up the user will have to re-establish the zooming factor for every page which he visits.
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