You can also do this without having to start Safari (just in case starting Safari REALLY bugs you).
In Firefox: Go to Firefox Menu -> Preferences Then, in the main tab, click the "Check now" button at the very bottom. If Firefox isn't the current default browser, you'll be prompted to make it so.
In times gone by in OSX, you could also use the internet preferences pane in System Pref's, but that's gone now.
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In Firefox:
Go to Firefox Menu -> Preferences
Then, in the main tab, click the "Check now" button at the very bottom. If Firefox isn't the current default browser, you'll be prompted to make it so.
In times gone by in OSX, you could also use the internet preferences pane in System Pref's, but that's gone now.