Firefox 57 has adapted a new system and many of the old extensions, including KBrowser are not supported anymore.
Luckily, we work with a Firefox compatible browser called Waterfox. Simply download Waterfox, add the KBrowser extension and you are ready to go.
If you lose your old desktop file, simply load it from the file menu.
Waterfox is soon releasing an extension store for adding Waterfox compatible extensions.
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