Originally Posted by rmjohnso
If you are running Slackware 32-bit, then you are using a binary that the Mozilla team releases and that Pat V. repackages as a Slackware package. If you are running Slackware 64-bit, Pat V. compiles Firefox from source. I think with Firefox 4, the Mozilla team has started to release pre-compiled 64-bit versions, but I could be mistaken.
As far as I know, with FF4 now even the 32 bit version is being compiled by Pat, and no longer repackaged from Mozilla's binaries. That is what he stated in some previous thread here in the forum. Things can always change, of course.
Proof is in source directory you find a tar.gz of ff4 sources, and a SlackBuild that actually does a compile.