Motivation

For IP Masking MVP we want to keep the experience for temporary users as consistent as possible with the current experience of unregistered editors (with the exception of Notifications). This is so that we don't introduce too many major changes all at once. In the post-IP Masking MVP future these changes can be re-evaluated.

Spec

• Temporary users should not been able to set user preferences
  • Disable access to Special:Preferences
  • Disable preference setting via the API

Notes:

• This is a follow up from T326759: Investigate: Which WMF deployed code might be affected by IP Masking?
• Editing and Web team rely on cookies for customizing preferences for unregistered editors. They will continue to use the same mechanism for temporary accounts in the future.