Bugzilla

In order to get the test to pass I also had to employ some hacks. Some of which might not be needed. Others might point to actual bugs.
- I wait for BrowserTestUtils.browserStopped instead of browserLoaded.
- I added a 20ms timeout after a process switch is performed.
- After waiting I use gBrowser.selectedBrowser instead of the previous browser object.

Without these I would get test timeouts on `await ContentTask.spawn(... get process id )`, and even sometimes I would get the processID of the previous process, indicating that maybe the ContentTask.spawn was executed in the previous browser instead.

In order to get the test to pass I also had to employ some hacks. Some of which might not be needed. Others might point to actual bugs.
- I wait for BrowserTestUtils.browserStopped instead of browserLoaded.
- I added a 20ms timeout after a process switch is performed.
- After waiting I use gBrowser.selectedBrowser instead of the previous browser object.

Without these I would get test timeouts on `await ContentTask.spawn(... get process id )`, and even sometimes I would get the processID of the previous process, indicating that maybe the ContentTask.spawn was executed in the previous browser instead.

See bug 1541389.