I upgraded my Slackware Box to Slackware-Current yesterday and there are many updated packages. Here is the Slackware Current Changelog.
Included is Xfce 4.4.2, this is the newest Xfce and has many bug fixes and a minor security bug fix in terminal. For the entire list you can look at the Xfce – 4.4.2 changelog
Firefox 188.8.131.52 is in this release which is good because sometimes the current repository contains older versions of Firefox.
The screenshot is just a screenshot of the GetFireFox page. Also, you will notice the nice transparencies feature of Xfce. Click it for the larger version.