Jeff Boek a8a90bd4d6 For #1063: Put tab tray behind a feature flag and hidden pref (#10313) ... * For #1063 - Adds feature flag and pref for new tab tray * For #1063 - Swaps add tab to tab tray button when newTabTray is enabled * For #1063 - Creates hidden preference to use new tab tray * For #1063 - Hides tabs on home screen when setting is enabled * For #1063 - Navigate to new tab tray from browser with setting enabled * For #1063 - Fixes regression where we dont show the new tab message with no tabs and no collections * For #1063 - Fixes crash when toggling to private mode on the home screen * For #1063 - combines both settings. Cleans up lint errors		2020-04-30 15:53:10 -05:00
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mozilla	For #1063: Put tab tray behind a feature flag and hidden pref (#10313)	2020-04-30 15:53:10 -05:00