Mozilla Firefox is an open source web browser. XULRunner provides the XUL Runtime environment for Mozilla Firefox.
In certain environments, storing personal Firefox configuration files (~/.mozilla/) on an NFS share, such as when your home directory is on a NFS share, led to Firefox functioning incorrectly, for example, navigation buttons not working as expected, and bookmarks not saving. This update adds a new configuration option, storage.nfs_filesystem, that can be used to resolve this issue. If you experience this issue:
about:config into the URL bar and press the Enter key.
If prompted with "This might void your warranty!", click the button.
Right-click in the list. In the menu that opens, select → .
Type "storage.nfs_filesystem" (without quotes) for the preference name and then click the button.
true for the boolean value and then press the button.