[Bug 1586822]

[Annettedunca18]

This change will allow more easily to change the default folder through
a pref. Though, that bug doesn't exist, so maybe we could convert this
one to cover that. [TalktoSonic](https://www.talktosonic.us/)

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https://bugs.launchpad.net/bugs/1586822

Title:
  Ability to set default save destination for new bookmarks

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