"While more and more platforms are getting (or aiming for) Firefox ports, the trunk itself seems to be going the other way. In an effort to clean up the API calls used and reduce the codesize a patch was posted at Bugzilla removing support from pre-W2k versions of Windows. There's a fiery discussion going on over at the Mozillazine forums about this after a counter bug was filed. The official position appears to be that Firefox 3.0 will maintain this un-compatibility, but developers are, obviously, free to work on a separate Win 98 compatible 'port.'"
The short answer is "no", but it is a qualified "no" because there are odd ways of interpreting the question which could justify the answer "yes". Light is composed of photons so we could ask if the photon has mass. The answer is then definitely "no": The photon is a massless particle. According to theory it has energy and momentum but no mass and this is confirmed by experiment to within strict limits. Even before it was known that light is composed of photons it was known that light carries momentum and will exert a pressure on a surface. This is not evidence that it has mass since momentum can exist without mass. [ For details see the Physics FAQ article What is the mass of the photon? ]. Sometimes people like to say that the photon does have mass because a photon has energy E = hf where h is Planck's constant and f is the frequency of the photon. Energy, they say, is equivalent to mass according to Einstein's famous formula E = m
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