Here's a profile of me reproducing the bug, waiting for a bit, and then resizing my browser window very-slightly to work around the bug: https://share.firefox.dev/3ZkR23U (viewport resizes apparently nudge Google to make the image-request and work around the bug; I think that viewport-resizing is the relevant piece of the "inspect" workaround in comment 2) I included network logging in that profile so that maybe the backtraces might help figure out where we are & aren't kicking off the image load...
Bug 1933229 Comment 5 Edit History
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Here's a profile of me reproducing the bug, waiting for a bit, and then resizing my browser window very-slightly to work around the bug: https://share.firefox.dev/3ZkR23U (viewport resizes apparently nudge Google to make the image-request and work around the bug; I think that viewport-resizing is the relevant piece of the "inspect" workaround in comment 2) I included network logging in that profile ~so that maybe the backtraces might help figure out where we are & aren't kicking off the image load...~ (Edit: I forgot to check the box for log backtraces, but I got some in the next comment.)