Bugzilla

When I test it I'm seeing a different result:

1. The old tab that starts off in the foreground is lowered
1. The new tab is raised with the expected uri
1. The parent process does things I haven't figured out
1. The old tab is raised
1. The new tab is lowered as it's uri is now `about:blank`
1. The parent process does more stuff.
1. The old tab is lowered again
1. The new tab is raised and the copy bug is apparent

To do this test I turned on logging with `export MOZ_LOG="Focus:5"` before running `./mach run`, then I set up the browser to have a foreground and a background tab at different URL's so it's easy to spot which process ID is which. Then I clicked on the terminal, made some empty space in the log, clicked on the browser, noted the action ID of that event, and dragged the background tab to a new window.

With the resulting log I replaced the process ID for the old tab with OldTab, the process ID for the new tab with NewTab, and the process ID for the Parent with ParentProcess to make this log output in a hopefully easier to follow format:

```

```

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