* $wgDebugPrintHttpHeaders - The default of including HTTP headers in the
debug log channel is no longer configurable. The debug log itself remains
configurable via $wgDebugLogFile.
+* $wgPasswordSalt – This setting, used for migrating exceptionally old, insecure
+ password setups and deprecated since 1.24, is now removed.
=== New user-facing features in 1.34 ===
* Special:Mute has been added as a quick way for users to block unwanted emails
strings like "5 days ago" instead of "5 days 13 hours ago".
* (T220163) Added SpecialMuteModifyFormFields hook to allow extensions
to add fields to Special:Mute.
+* (T100896) Skin authors can define custom OOUI themes using OOUIThemePaths.
+ See <https://www.mediawiki.org/wiki/OOUI/Themes> for details.
=== External library changes in 1.34 ===