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a175a57a4e
browser.sessionhistory.cache_subframes has been disabled for 12yrs. It's not actually maintained and it leaks content viewers. Using this unreliable feature in test cases is a bad practice, so remove the pref completely and fix existing test cases. MozReview-Commit-ID: 3tQLpsqmmaq --HG-- extra : rebase_source : ce6e27c7d422f32dec858712eba5ed8011ee8039