Bug 847833 - Add test against `cfx init`.
Bug 836471 - update documentation for per-window private-browsing; r=@erikvold
Merge pull request #872 from wbamberg/836471-2

Bug 836471 - update documentation for per-window private-browsing; r=@erikvold
Merge pull request #873 from jsantell/apply-panel-style-once-819578

Fix bug 819578, Default styles in panels should only be applied once, a=@gozala
Bug 843823 - document last-pb-context-exited event in private-browsing module
Merge pull request #833 from ochameau/cfx-init-tests

Bug 847833 - Add test against `cfx init`. r=@gozala
Fix bug 833171 - system/events example needs to be a strong reference
Fix bug 843823 - Fix the last-pb-context-exited example in the documentation
Merge pull request #878 from KWierso/843823

Fix bug 843823 - Document last-pb-context-exited event in private browsing module r=@erikvold
Merge pull request #877 from KWierso/833171

Fix bug 833171 - system/events example needs to be a strong reference
Only one panel should be shown at a time, and do not display xulPanel if Panel.hide() called right after Panel.show()