Your STR is unrelated to this bug. I can still reproduce the issue with STR of comment#0 on Nightly141.0a1 Windows11.
Bug 1922777 Comment 26 Edit History
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Your STR is unrelated to this bug. Before `Quit the browser`, you should close the sidebar. Then relaunch browser and open sidebar from the legacy sidebar toolbar button. I can still reproduce the issue with STR of comment#0 on Nightly141.0a1 Windows11.
Your STR is unrelated to this bug. Before `Quit the browser`, you should close the sidebar. Then relaunch browser and open sidebar from the legacy sidebar toolbar button. I can still reproduce the issue with STR of comment#0 on Nightly141.0a1 Windows11.