A user reported an unusual problem here.

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He found that when he wished to view an HTML file, when Firefox opened all he saw was Fast Dial.

The fix to this problem was the following

In Firefox go to Tools/Options/Tabs

This problem was seen to occur when the tab setting is set to "hide the tab bar when I only have one tab".
With this setting Fast Dial is displayed, instead of the HTML file.

Change the setting to "never" and the problem goes away.