1708097 - Clicking "Try Again" on "Server Not Found" page shows flash of "Go Back (Recommended)" button and associated content for 1 frame

Status: NEW

(Firefox :: Security, defect)

Description

[Peter deHaan [:pdehaan]]

This comment is copy/pasted from a community issue filed during the Foxfooding program.

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Firefox Version: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
Window Size (inner width and height): 1920x978

Steps to Reproduce

1. Visit non-existent site (e.g. ergikjmerslkgj.com)
2. Click "Try Again"

Expected Behavior

Just try again

Actual Behavior

Tries again, but also shows "Go Back (Recommended)" button

Comment 1

[Peter deHaan [:pdehaan]]

Reproduced on macOS 10.15.7/Catalina using Firefox 90.0a1/Nightly, but not 89/Beta or 88/Release.

Comment 2

[Peter deHaan [:pdehaan]]

Attachment: try-again-flicker.gif

Comment 3

[:Gijs (he/him)]

This isn't a proton issue. It regressed with bug 1688703, and won't ship with 89. Clearing all the proton flags. Dana, can you take a look? I think this is a side-effect of about:neterror now having to load all the extra cert parsing code.

Comment 4

[Dana Keeler (she/her) [:keeler]]

I believe this is a preexisting issue that bug 1688703 made more apparent. Some of the code on that page runs asynchronously, so it makes sense that it's possible to see the page in a broken state before everything has finished running. The page should probably be completely blank until initialization has finished.

Comment 5

[Johann Hofmann [:johannh]]

The page should probably be completely blank until initialization has finished.

I agree, that would probably solve this whole category of (IMO very minor) issues.