[Merge] lp:~mterry/webbrowser-app/switch-tab-keybinding into lp:webbrowser-app

[Olivier Tilloy]

The autopilot tests are usually fairly stable, but it’s not uncommon to see one or two random failures. The failures here seem completely unrelated to your branch, but given there are 4 of them, which is higher than usual, I’ll trigger a new CI run.
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https://code.launchpad.net/~mterry/webbrowser-app/switch-tab-keybinding/+merge/272671
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