Can we work around this by having the relevant API in `ext-browsers` check if the window is in BrowserWindowTracker.windows, and if not, wait for it to be (probably using `registerOpeningWindow` or similar) ?
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Can we work around this by having the relevant API in `ext-browser` check if the window is in BrowserWindowTracker.windows, and if not, wait for it to be (probably using `registerOpeningWindow` or similar) before trying to figure out the active tab there?