Attached a video. At 52 seconds in is the state I expect the browser to be in on restart:
- "test" window is open
- "Henry Kissinger" is top level and at the top
- All tabs have populated titles
At 1:03, "test" is not the open window. After opening "test" at 1:08, "Henry Kissinger" is a sub tab of "Wikipedia" and what was the sub tab of "Wikipedia" at closing now has the domain name title "en.wikipedia.org" rather than "United States Secretar..."
Note that this is of course a very simple demo. With enough nesting and tabs open from the same domain, a restart can really mess the tree up. This doesn't seem to be an issue in the default or maybe just unnamed windows.