bug 940685 - open about:home instead of searchForm if the search bar isn't available, r=gavin

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extra : rebase_source : 2bd877e984aab76cd3cdca3973a5f40952c6e1e1
Bug 940685 - adjust UI test to expect about:home, r=gavin

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extra : rebase_source : 14c563626da311ee6c87aa5a73f92e8dbae3c97c
Bug 958883 - Use HTTPS for Yahoo searches, part 1, r=gavin

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extra : rebase_source : dfa4223c3b226d3d46150051a7b9c22a88c4c432
Bug 958883 - Use HTTPS for Yahoo searches, part 2, r=mfinkle

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extra : rebase_source : dcb82051a9aa64c2c9899f36b5290575bf87560e
Bug 991359 - update context menu form code for Bing, r=gavin

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extra : rebase_source : 2cd77c32b9a26bee79d594cf45ba5d4cfcbd453e
Bug 984530 - Bing search tags are not working properly, r=mfinkle

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extra : rebase_source : f17fb1d8493b277bdad6a6e2ed1dde545cd1077e
Bug 983723 - Yahoo search tags are not working properly, r=mfinkle

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extra : rebase_source : 943c79f0b0e722ccb9603005e5c97c20745ead54