Bug 963143 - Australis - fix nits for download finish notification patch, rs=mak

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extra : rebase_source : dec8b20839abdfccb9429d949b2e20709495ad9d
Bug 969584 - Patch 3: Consolidate typography and sizing of panel subview items for Australis, r=mikedeboer

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extra : rebase_source : c9fcac25fedf0521fdcca7bccb7052587b4c1594