jeurissen This may cause runtime errors for extensions relying on this event. See demo extension: https://jeurissen.co/webext-demos/action-user-settings For this event to at least be registrable. Version 1.1.1 (149), WebKit 625.1.8 Tahoe (26)
jeurissen Proposal document: https://github.com/w3c/webextensions/blob/main/proposals/action-on-user-settings-changed-api.md W3C issue: https://github.com/w3c/webextensions/issues/346
