Bug 1059600 - Set the URI as the initial tab label for javascript links opened in new tabs. r=gijs

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extra : rebase_source : 07dfeabaf245f791300415df3f072ded5c4fdd81
Bug 1106238 - about:home search icon has a solid background, should be transparent. r=felipe

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extra : rebase_source : 4683852f44862f9bd3dee83669aeb9ebb4fe41dd
Bug 1105579 - increase browser_lastAccessedTab.js error tolerance further

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extra : rebase_source : ae86e46ae659fc797cf8f20ae8c909f0a2f3cee9