2 quick Iceweasel/Firefox questions.
1. How can I stop iceweasel/firefox opening a second instance (or window) if I click the launcher twice?
2. How can I preload iceweasel/firefox (and only iceweasel/firefox) on startup?
Explaining why I need to do this is a long story and quite hard to explain so I just need ways to do both of the above please.
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