I frequently accidentally close the artist editor by hitting Ctrl+W instead of Ctrl+V (they're next to each other in my keyboard layout). When I do this, I can restore the tab in Chrome with Ctrl+Shift+T, but any values that I entered in JavaScript-heavy fields (Area, Relationships, External Links) are lost.

The release editor (MBS-5530) and relationship editor (MBS-5364) both use beforeunload to prompt the user if they have any unsaved edits. I think that the relevant code for the release editor is at https://github.com/metabrainz/musicbrainz-server/blob/ef9817a85c7cae102aaf3ce8277ca78dbf48fe0a/root/static/scripts/release-editor/init.js#L260-L277.

It would be nice if the same approach could also be used in all other forms:

• Add/Edit Artist
• Add/Edit Label
• Add/Edit Release Group
• Add Standalone Recording
• Add/Edit Work
• Add/Edit Place
• Add/Edit Series
• Add/Edit Event
• Edit Recording

(I'm sure that I missed some!)