[Tracking Requested - why for this release]:
We accidentally used the wrong pref name for the new bookmark sync gradual rollout, so it didn't have any effect. We'll roll out to 25% of release tomorrow, but there isn't a lot of time left in the 70 cycle, meaning any bugs we see will remain unfixed in 71—and will need to be fixed in 73 and uplifted to 72.
I think it would be safest to:
- Back bug 1588005 out of Beta 71 only. Keep it in Nightly 72, so that it'll still be pref'd on by default when we merge in a couple of weeks.
- Change the gradual rollout experiment to target 70 and 71.
- Monitor our dashboard, and fix any bugs as they come up.
How does that sound to everyone? There's no rush to get new bookmark sync out—slipping one release won't make a big difference, and I think it's worth waiting to make sure we aren't messing up our users' bookmarks.