What Firefox replaced, and what HTML added back

These are synthetic public research bookmarks. Their JSON and HTML files were exported and imported by Firefox 141.0 in an isolated, unsigned profile on October 7, 2026. The trial used Firefox's native bookmark modules, not the Library dialog.

Before restore: 2 bookmarks

Bookmarks Menu / New research

CSS reference
ECMAScript specification

Current JSON backup · Current HTML export

After restoring the older JSON: 2 bookmarks

Bookmarks Menu / Recovered research. New research is gone. The ECMAScript link is absent.

CSS reference
Firefox help

Older JSON backup · Actual result exported after restore

After importing the saved current HTML: 4 entries, 3 URLs

Recovered research remains. New research is added. CSS reference appears once in each folder.

Recovered research

CSS reference
Firefox help

New research

CSS reference
ECMAScript specification

Actual result exported after HTML import

You can inspect these files as text without importing them. Practice restoration only in a disposable browser profile. The files contain the example links above, not your lost bookmarks.