I forgot to mention a few weeks ago that John Haller from PortableApps.com had updated the Firefox Portable (that is the new name, it’s no longer known as Portable Firefox) to version 22.214.171.124. The update fixed the Windows Media Player bug that many people were experiencing troubles with.
If you are already running Firefox Portable 126.96.36.199 you are able to utilize the partial update system. You can initiate the update by going to the Help menu and selecting “Check For Updates.”
For a whole list of new features that Firefox Portable 188.8.131.52 brought checkout this post.