~mozillateam/firefox/firefox.bionic

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// Disable default browser checking.
pref("browser.shell.checkDefaultBrowser", false);

// Don't disable extensions dropped in to a system
// location, or those owned by the application
pref("extensions.autoDisableScopes", 3);

// Don't display the one-off addon selection dialog when
// upgrading from a version of Firefox older than 8.0
pref("extensions.shownSelectionUI", true);