These tests were timing out because `about:home` now runs in a different process.
Since these two tests aim to test something else (e.g. window leaks when
navigating between pages), we will redirect to a URL that loads in the same
process instead of `about:home` to avoid adding extra conditions for the
process flip.
See Bug 1336811 and Bug 1242643.
MozReview-Commit-ID: G0rhfA973R9
--HG--
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