The Old3DS+New3DS 9.9.0-26 system update was released on July 13, 2015 for all available regions.
- Further improvements to overall system stability, system security, and other minor adjustments have been made to enhance the user experience
Both platforms' browsers (spider and SKATER) were updated. The wording in the changelog would seem to imply that webkit received bugfixes or was otherwise updated.
System update reports: