You are correct, it is usually best to stick to the versions in the repositories.
That said, there is currently a problem with the updating mechanism of our repo. I like to keep my browser up to date, so this is what I did:
As root, in a terminal,
cd
mkdir -p firefox/src
cd firefox/src
wget http://vectorlinux.osuosl.org/veclinux-6.0/source/testing/net/firefox/3.6.13/src/mozilla-firefox.SlackBuild
wget http://vectorlinux.osuosl.org/veclinux-6.0/source/testing/net/firefox/3.6.13/src/mozilla-firefox.desktop
chmod +x mozilla-firefox.SlackBuild
mcedit mozilla-firefox.SlackBuild
at this point, find the version number (3.6.13, at line 14) and change it to 3.6.15
press F2 to save, F10 to exit, then enter command:
./mozilla-firefox.SlackBuild
it will take a while. When it is done:
cd ..
upgradepkg firefox-3.6.15-i586-1vl60.tlz
You may delete the /root/firefox directory when done. No guarantees. Use at own risk.