[Merge] lp:~fboucault/webbrowser-app/background_open_tabs_adjacent into lp:webbrowser-app/staging

[Olivier Tilloy]

> I think this behaviour could have been implemented before this branch.
> Therefore I would say it is very independent and think we should
> implement it separately.

Filed bug #1664990 to track its implementation.
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https://code.launchpad.net/~fboucault/webbrowser-app/background_open_tabs_adjacent/+merge/316226
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