Bug 31300: Modify Tor Launcher so it is compatible with ESR68
Replace some wizard and dialog "on" attributes with event handlers. Replace the XUL listbox element (which was removed by Mozilla) with richlistbox. Replace the XUL progressmeter element (which was removed by Mozilla) with an HTML progress element. Define our own CSS rules for groupbox elements (Mozilla removed the built-in styles). Fix some minor CSS incompatibilities.
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