Bug 944079 - remove double hover state in Australis bookmarks menu, r=MattN

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extra : rebase_source : 9cce08d65ad480e36f0b7ce3ee6ebee4a3b44fe2
Bug 952753 - don't use level='top', do use noautofocus, for Australis overflow panel, r=MattN

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extra : rebase_source : f41a90624996df745a89b0d0bccad21c0356dabb
Bug 973502 - constrain max width of Australis bookmarks menu, r=Unfocused

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extra : rebase_source : b515c86803e839aed1e3834c38e83c00c7419762