Changes in 20191020094538

Built from 4b332005f92551e4c96e74a150a601764f76aa02

..index..
Bug 1584006 R[Core:js-ctypes]undefined shift in js/src/ctypes/CTypes.cpp:8708
Bug 1586991 R[Core:JavaScript Engine]Stop relying on or using flat strings in a number of places
Bug 1588899 R[Core:Networking: Cookies]browser_trackingUI_cookies_subview.js fails with DocumentChannel
Bug 1589543 R[Firefox:Address Bar]URL bar focus ring doesn't appear while input is hovered
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Changes to 4 bugs - 4 fixed.