Match what you see to the first check
| What you see | First check | Hold off on |
|---|---|---|
| The toolbar disappeared | Toolbar visibility and the bookmark list. | Restoring a backup just to restore the toolbar. |
| Only default bookmarks | Whether Firefox launched a different profile. | Deleting apparently empty profiles. |
| Bookmarks remain on another device | The account and bookmark Sync selection. | Assuming the local set was erased by the update. |
| A known backup exists | Its date, format and the current destination set. | Confirming Restore before preserving current bookmarks. |
These branches follow Mozilla’s missing-bookmark guidance. They identify possibilities, not the cause of every case.
Check whether the bookmarks are hidden rather than gone
- Open the bookmark manager and inspect the folders there. A missing toolbar is not proof that the bookmark set is missing.
- If the toolbar alone disappeared, right-click an empty area of the navigation bar and select the bookmark-toolbar option.
- If bookmarks were imported, inspect the folder named for the source browser.
Recover lost or missing bookmarks
Stop the recovery process here if the wanted bookmarks are visible. Replacing data to fix a display choice can discard newer bookmarks unnecessarily.
Look for the profile that contains the data
Type about:profiles into Firefox’s address bar. The page identifies the profile currently in use. If another profile exists, Mozilla documents launching it in a separate browser window to inspect its bookmarks. Keep both profiles while you determine which holds the wanted data. Recover lost or missing bookmarks
A profile contains its own user information. Mozilla’s Profile Manager also has default-profile and removal controls; inspection does not require either. If you create a new profile, its default status can change what opens next time, so read the official instructions before using those controls. Create or switch Firefox profiles
Choose an existing recovery source deliberately
If a different profile already contains the wanted bookmarks, using that profile may avoid restoring an older copy. If you instead choose a bookmark backup, compare its date with what is missing and preserve the current bookmark set first. Restore replaces that set; HTML import is a different operation used to combine sets. Restore bookmarks from backup
An Old Firefox Data folder can be relevant after Refresh. For a complete profile copy, follow Mozilla’s manual recovery instructions and their destination-file cautions. Do not move or replace a folder merely because its name resembles another profile.
Choose the copy you actually want to recover
Keep a short inventory before making a change: current profile, any other profile with wanted data, dated bookmark files, and an Old Firefox Data folder if present. Write down which one contains a known bookmark. A folder’s existence alone is not proof of its contents.
- If another profile contains the wanted set, open it and verify the bookmarks before choosing it as the default. Keep the other profiles while checking.
- If a bookmark backup is needed, preserve the current set, compare dates, then use the bookmark restore steps.
- If you have a complete profile copy instead, follow the separate-destination profile procedure and check its version/platform limits.
An example inventory might show a current profile with default bookmarks and an older profile with your known folders. In that case, the useful finding is where the data lives; it does not establish that an update deleted it.
If the current profile has newer bookmarks too
Decide whether you need an old snapshot or a combined set before opening Restore. Preserve the current set first. HTML import can serve a combining task when you have an HTML export. Keep a JSON backup intact and use its supported restoration method; do not rename it as HTML.
If there is no known source for the missing items, stop replacing sets. Keep the candidate profiles and dated files for investigation. A reset is not a recovery source.
Know when the evidence is insufficient
If you cannot identify a profile, backup or device containing the data, recovery remains uncertain. A new reinstall cannot establish that a missing copy exists. Record what is absent, where you checked, the running version and whether other devices still hold the bookmarks. Bring that description to Mozilla Support without posting your profile files, passwords or browsing history.
What our controlled Firefox test showed
The named fake bookmarks were absent from a newly created profile, while the original profile’s bookmark database remained unchanged. This reproduces the distinction between a different profile and deleted source data, using fake data rather than an actual update-loss incident.
Automated checks on Windows with the Playwright-patched Firefox 155.0 engine and Mozilla geckodriver. Fresh profiles and fake data only.
The test notes record the method and results. Bookmark export/import used Firefox’s core APIs; menu instructions are documentation-checked. Built-in Backup, Sync accounts, Refresh and safe-mode restarts were outside the experiments.
Sources & scope
Source checks are dated individually below. Interface labels and availability may vary by version and platform. Controlled Windows Firefox experiments are described in this guide and in the linked test notes.
- Recover lost or missing bookmarks Likely cause and different-profile checks · Checked 2026-10-07
- Create or switch Firefox profiles Manage profiles when Firefox is open · Checked 2026-10-07
- Restore bookmarks from backup Restoring from backups and Sync · Checked 2026-10-08
- Manually back up and restore profile data Manual backup and restoration · Checked 2026-10-07
Source review: Firefox Updates Verification Desk, an automated editorial role. Read the AI and verification disclosure.