1918068 - Default favicon (wireframe globe) appears while loading vertical tabs despite site having a favicon

Status: ASSIGNED

(Firefox :: Sidebar, defect, P2)

Description

[Kestrel]

Attachment: Wireframe globe icon appearing while loading

STR:

1. Start with sidebar.verticalTabs = true and sidebar.revamp = true.
2. Visit github.com.
3. At the top of the page, open the link to githubuniverse.com ("Explore the full schedule and get tickets now") several times in new tabs.

Expected:
Default favicon is only shown when site doesn't have a favicon.

Actual:
Default favicon (wireframe globe) appears while loading. It flickers briefly for fast sites but can appear for several seconds for slow sites, before and/or after the loading animation.

In comparison, horizontal tabs only show the default favicon as fallback when the site does not provide one.

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=ceca0963d7196cb8b1d0804ebe682c236c7b1e3a&tochange=06914b4eaad0653829331b51d44339a5f77c6950

Regressed by Bug 1909843.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

:sclements, since you are the author of the regressor, bug 1909843, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1909843