v155.0 (2026-08-13)

✨ What's Changed ✨

Add AdsClient::shutdown(), which closes the database connection early so it happens before Firefox Desktop's late-write shutdown barrier rather than during GC. In addition, this drops all held UniFFI callbacks (held in the MozAdsTelemetryWrapper) to avoid crash on a Firefox Desktop quit.

Add Store::shutdown(), which closes the database connection early so it happens before Firefox Desktop's late-write shutdown barrier rather than during GC. Operations after shutdown return DatabaseClosed. (Bug 2050036)
Add address metadata APIs for importing records already persisted elsewhere: add_address_with_meta, add_many_addresses_with_meta, update_address_with_meta and add_many_address_tombstones, with the bulk variants isolating per-record failures. AddressMeta carries the guid, timestamps and sync_change_counter, so a record keeps whether it still has changes pending upload.
Add Store::addresses_bridged_engine(), exposing the existing address sync engine through mozIBridgedSyncEngine so Firefox Desktop can drive address sync.

The CheckAuthorizationStatus and Disconnect events are now valid from all states except Uninitialized.
In the cases where the failed before, they're now no-ops.

NimbusClient::get_available_firefox_labs() now includes detailed debug level logging for each processed lab. (#7482)

Replacing v1 routes with v2 routes, removing added v2 routes (#7492)
Verify signature of imported data when .get() is called with sync_if_empty: true (#7518)
Do not quote _since values with the v2 API (#7523)

SyncManager::sync() now fails immediately with a new SyncManagerError::Busy when a sync is already in progress, instead of blocking until it finishes.