[Merge] lp:~uriboni/webbrowser-app/tab-context-menu into lp:webbrowser-app

[Olivier Tilloy]

Review: Disapprove

Superseded by https://code.launchpad.net/~osomon/webbrowser-app/uriboni-tab-context-menu/+merge/272148, which addresses all the comments above.
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https://code.launchpad.net/~uriboni/webbrowser-app/tab-context-menu/+merge/268220
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