Don't reload synced tabs everytime

[topotropic]

Right now the synced tabs screen is reloaded on every view – depending on the amount of open tabs on other devices this can take a while. Could we display the screen w/o reloading and then sync on refresh (pull down) or find another way to sync tabs w/o making people wait every time they access synced tabs?

┆Issue is synchronized with this Jira Task

[topotropic]

@grigoryk is this still happening? Thanks!

[grigoryk]

@topotropic Not in the way you describe, but we will wait until the first sync completes during startup before being able to display any synced tabs - they're not persisted to disk, so we loose all that state after a restart and have to refetch it from sync servers.

See mozilla/application-services#3373
and a semi-related synced-tabs UI issue in which we sync sync tabs data every time we switch in and out of ... private tabs! #23199

[jonalmeida]

Closing as won't fix since the UX and implementation of the Sync Tabs screen has changed and I think we've largely fixed most of the slow initial sync issues in the tabs tray Sync Tabs UI.