Bug 971626 - [Australis] Restore Defaults should collapse Title Bar. r=Gijs a=sledru

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extra : rebase_source : 665f91afeacbfd7459555ec4818ee706b0548bc3
Bug 966678 - Australis' customize mode's "Restore defaults" button disabled styling isn't obvious. r=mconley a=sledru

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extra : rebase_source : 182d0fe354498c3ffdf6b0cf8a3f0166fe061225
Bug 940379 - [Australis] Bookmarks panel isn't aligned with other panels. r=Gijs a=sledru

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extra : rebase_source : 374ba2bda6bdd8d615c76099874bd5a2fef3a4ea
Bug 911904 - Remove html handlers from helper apps. r=margaret a=lsblakk
Bug 969756.  r=cam a=abillings
Bug 946873 - fix Australis bookmarks menu button (literal) edgecase, r=Unfocused, a=sylvestre
Bug 966683 - Australis - automatically toggle accesskey-focuses on Linux to prevent menubar focus stealing, r=Neil,dao, a=sylvestre
Bug 969853 - use label instead of title attribute for labels in Australis customize palette, r=Unfocused, a=sylvestre
Bug 972822 - Australis - persist the currentset attribute correctly when appending tabgroups button, r=dao, a=sylvestre
Bug 973153 - disable (undo) reset buttons at the start of Australis' customize mode transitions to prevent breakage, r=Unfocused, a=sylvestre
Bug 974229 - Remove unused star-button from Australis. r=Dao, a=sylvestre
Bug 974819 - don't reset Australis' TabsToolbar collapsed state, add UI migration to fix this in existing profiles that may have used reset() since this was done, r=mconley, a=sylvestre
Bug 975372 - make Australis' customizeMode's undoReset not error out at the end when the gSavedState is null, r=jaws, a=sylvestre
Bug 962140 Log more details in the queue when PeekMessage() fails to remove found char message rjimm, a=sledru
Bug 966992 - Add a CSS_PROPERTY_ALWAYS_ENABLED_IN_UA_SHEETS bit for properties that are enabled by a pref but that are always enabled in UA sheets.  r=cam  a=sledru
Bug 966992 - Implement the overflow-clip-box property in the style system.  r=cam  a=sledru
Bug 966992 - Implement layout for the overflow-clip-box property.  r=roc  a=sledru
Bug 965237 - Make overflow-clip-box:content-box be the default for <input type=text/password/number> and <textarea>.  r=roc  a=sledru
Bug 966992 - overflow-clip-box:content-box tests.  a=sledru
Bug 967752 - Use media queries instead of the more expensive vw unit to adjust the identity label for small windows. r=jaws a=sledru