[Merge] lp:~ahayzen/webbrowser-app/migrate-to-tabs-component into lp:webbrowser-app/staging

[Olivier Tilloy]

And seeing them again after re-opening a good number of tabs (11), closing the app and starting it again.
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https://code.launchpad.net/~ahayzen/webbrowser-app/migrate-to-tabs-component/+merge/312340
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