Firefox for iOS Community Forum

Firefox Sync is not syncing bookmarks from Windows to iPhone.

The issue persists even after creating a completely new Firefox Account, creating a new Firefox profile, reinstalling Firefox, and testing on a different network.

Environment Windows 11 Firefox 153.0 (64-bit) Firefox downloaded from mozilla.org (not Microsoft Store) Firefox for iPhone (latest version) VPN disabled Windows Defender only (no third-party antivirus) Problem

Bookmarks created on the iPhone never appear on the Windows PC.

Bookmarks created on the Windows PC also never appear on the iPhone.

The iPhone currently contains more than 1,000 bookmarks.

Tabs and account sign-in appear to work normally, but bookmark synchronization does not.

Troubleshooting already performed Created a new Firefox profile. Reinstalled Firefox. Created a completely new Firefox Account. Signed out and signed back in. Reset Sync. Verified that bookmark sync is enabled. Confirmed services.sync.engine.bookmarks = true. Tested with VPN disabled. Tested using a mobile hotspot instead of the home network. Verified DNS resolution using nslookup. Verified Mozilla servers are reachable from Chrome. Confirmed Firefox DNS settings are default: network.trr.mode = 0 network.dns.disableIPv6 = false Sync log observations

The Sync log reports that bookmark changes are detected:

Sync.Engine.Bookmarks.BookmarkSyncUtils pushChanges: Processed change records: {"updated":9}

However, the log never contains a request similar to:

POST ... /storage/bookmarks

Therefore, bookmark changes appear to be detected locally but are never uploaded to the Sync server.

In different sync attempts, I have also observed intermittent network-related errors such as:

NS_ERROR_NET_RESET NS_ERROR_CONNECTION_REFUSED NS_ERROR_UNKNOWN_HOST

For example:

Failed to fetch symmetric keys. Not syncing: login returned false.

and

The lookup of the hostname failed.

However, DNS resolution and connectivity appear normal outside Firefox:

nslookup successfully resolves Mozilla Sync hosts. ping succeeds. Opening https://profile.accounts.firefox.com/v1/profile from Chrome returns the expected HTTP 401 Unauthorized response ("Bearer token not provided"), indicating the server is reachable. Additional information

Because the iPhone contains more than 1,000 bookmarks, I would also like to know whether Firefox Sync has any known limitations or issues related to synchronizing large bookmark collections.

Expected behavior

Bookmarks created on either device should synchronize to the other device.

Actual behavior

Bookmark changes are detected locally but never uploaded, and no bookmark synchronization occurs in either direction.

I would appreciate any guidance on additional diagnostics or whether this could be a Firefox Sync bug.

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See also: https://support.mozilla.org/en-US/questions/1552007

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