Remove `DownloadableSubscription.useSynchronizer`
Background / User story
With issue #430 (closed) we removed a lot of the singletons. However there is still DownloadableSubscription.useSynchronizer
which is meant to associate THE synchronizer to the downloadable subscriptions.
This not consistent.
What to change
-
Development:
- Change the the code so that useSynchronizer is no longer a thing
- Follow up with webext-sdk change if needed.
-
Documentation:
- Update the API doc (likely)
Hints for testing
TBD
Integration notes
TBD