I just tried to install the Linux version of Firefox version 23 with vpackager and got the following result:
firefox/
firefox/firefox
firefox/libmozalloc.so
firefox/dependentlibs.list
firefox/mozilla-xremote-client
firefox/libfreebl3.so
firefox/libssl3.so
firefox/libnssdbm3.chk
firefox/libxul.so
firefox/omni.ja
firefox/dictionaries/
firefox/dictionaries/en-US.dic
firefox/dictionaries/en-US.aff
firefox/Throbber-small.gif
firefox/run-mozilla.sh
firefox/crashreporter
firefox/components/
firefox/components/libdbusservice.so
firefox/components/components.manifest
firefox/components/libmozgnome.so
firefox/libmozsqlite3.so
firefox/libsmime3.so
firefox/libnss3.so
firefox/crashreporter.ini
firefox/updater.ini
firefox/libnspr4.so
firefox/icons/
firefox/icons/updater.png
firefox/application.ini
firefox/precomplete
firefox/libfreebl3.chk
firefox/libplc4.so
firefox/firefox-bin
firefox/libnssckbi.so
firefox/updater
firefox/defaults/
firefox/defaults/pref/
firefox/defaults/pref/channel-prefs.js
firefox/plugin-container
firefox/webapprt/
firefox/webapprt/webapprt.ini
firefox/webapprt/omni.ja
firefox/libnssutil3.so
firefox/browser/
firefox/browser/omni.ja
firefox/browser/components/
firefox/browser/components/components.manifest
firefox/browser/components/libbrowsercomps.so
firefox/browser/icons/
firefox/browser/icons/mozicon128.png
firefox/browser/searchplugins/
firefox/browser/searchplugins/google.xml
firefox/browser/searchplugins/twitter.xml
firefox/browser/searchplugins/amazondotcom.xml
firefox/browser/searchplugins/eBay.xml
firefox/browser/searchplugins/yahoo.xml
firefox/browser/searchplugins/wikipedia.xml
firefox/browser/searchplugins/bing.xml
firefox/browser/extensions/
firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/
firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/icon.png
firefox/browser/extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}/install.rdf
firefox/browser/chrome.manifest
firefox/browser/crashreporter-override.ini
firefox/browser/chrome/
firefox/browser/chrome/icons/
firefox/browser/chrome/icons/default/
firefox/browser/chrome/icons/default/default48.png
firefox/browser/chrome/icons/default/default32.png
firefox/browser/chrome/icons/default/default16.png
firefox/browser/blocklist.xml
firefox/chrome.manifest
firefox/libnssdbm3.so
firefox/update-settings.ini
firefox/libsoftokn3.so
firefox/libsoftokn3.chk
firefox/platform.ini
firefox/webapprt-stub
firefox/removed-files
firefox/libplds4.so
firefox.SlackBuild: line 132: /tmp/vpackager/firefox/23.0.1/src/patches/*: No such file or directory
cp: cannot stat `/tmp/vpackager/firefox/23.0.1/src/patches/*': No such file or directory
Setting permissions...
Configuring source...
firefox.SlackBuild: line 175: ./configure: No such file or directory
*** No more jobs in queue. Stopping bot ***
(Firefox version 23 is in ".bz2" format, by the way). Any suggestions on how to get it installed?