New features:

When making a new user script, it will include a `@match` for the current page. (#3231)
- Thank you community member Cerberus-tm!
Several new features in the built in script editor, most optional (enabled by default). (#3230)
Improved user interface around automatic updates, especially to detect more failure cases and explain them. (#3182)

Fixed bugs:

Do not block script installation when the `@icon` fails to download. (#3222)
Importing a user script backup that contains a script with a forward slash character in the name should work. (#3210)
- Thank you community member nabijaczleweli!
Fixed cookie header handling for `GM.xmlHttpRequest()`. (Previously, it worked only when this was the last header.) (#3205)
- Thank you community member syusui-s!
Fix partially obscured confirmation dialog when updating an edited script. (#3180)
Improved reliability of script execution at Firefox start up time. (#3117)
- Thank you community member binki!
Improve `GM.xmlHttpRequest()` when `privacy.firstparty.isolate` is `true`. (#2985)
- Thank you community member Scripter17!
Fix `GM.xmlHttpRequest()` when passing functions in the `context`. (#2701)