OSX: default bookmarks not used

Our Tor Project bookmarks are not used by default in the ESR52-bssed TB nightly builds (I saw this problem on OSX with the builds mentioned here: comment:1:ticket:21875).

Although our bookmarks.html file is included in browser/omni.ja, it seems to be ignored. Maybe ESR52 uses a new mechanism for configuring the default bookmarks.

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