Looking at a profile, it looks like we get a call to `getSyncedTabData` every time you advance between tour "slides". That's presumably repopulating this section from scratch. So there are two distinct issues here: (1) We're unnecessarily forcing this section to refresh itself between tour "slides". That seems wasteful and unnecessary. (2) When this section refreshes itself (including if its content doesn't change), it causes this flash. Presumably this happens regardless of the tour (but probably it's rare, aside from the scenario described here)
Bug 1791089 Comment 3 Edit History
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Looking at a performance profile of the tour, it looks like we get a call to `getSyncedTabData` every time you advance between tour "slides". That seems unexpected. And that's probably repopulating this section from scratch. So there are two distinct issues here: (1) We're unnecessarily forcing this section to refresh itself between tour "slides". That seems wasteful and unnecessary. (2) When this section refreshes itself (including if its content doesn't change), it causes this flash. Presumably this happens regardless of the tour (but probably it's rare, aside from the scenario described here)