- The private file an export writes in Firefox and Safari is deleted
when the app starts and when someone signs in, not only at the next
export, and at once on sign-out. Close keeps it until its download
had time to finish. Each tab holds its own files under a Web Lock, so
one tab's sweep no longer deletes another tab's running export.
- A browser whose private file system can't write files (Safari before
26) is told the export stays in memory instead of being promised a
download.
- The export's live region announces only the phase and pauses; the
count next to it no longer floods screen readers, and the format
group is named once.