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    <p>This appears to be an intended change (don't ask me why).  see
      bug <a class="moz-txt-link-freetext" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1355331">https://bugzilla.mozilla.org/show_bug.cgi?id=1355331</a></p>
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    <div class="moz-cite-prefix">On 4/22/17 9:57 AM, M Henri Day wrote:<br>
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cite="mid:CAM9zRCpWi4X88kroujf=7dN2r6R3K9i4dom8jp4xq1LCpRQ__Q@mail.gmail.com"
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          <div
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            class="gmail_default">​<span style="color:rgb(0,0,255)">After
              updating Nightly (to 55.0a1 (2017-04-22) (64-bits)) this
              afternoon​ on my Windows 10 Pro (v 1703) machine, I noted
              to my surprise (and displeasure) that my bookmarks sidebar
              opened to the right of the Nightly window, instead of to
              the left, which has been its customary position. In
              Firefox 53.0, this was not the case, nor was it the case
              on Nightly (55.0a1 (2017-04-22) (64-bits)) or Firefox 53.0
              on my Linux Mint 18.1 box....</span></div>
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            class="gmail_default"><span style="color:rgb(0,0,255)">Any
              suggestions as to how I could entice the the bookmarks
              sidebar to return to the left side of the Nightly windows
              on my Windows 10 Pro machine ?...</span></div>
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            class="gmail_default"><span style="color:rgb(0,0,255)">Henri</span><br>
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      <pre wrap="">_______________________________________________
Nightly-testers mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Nightly-testers@mozilla.org">Nightly-testers@mozilla.org</a>
<a class="moz-txt-link-freetext" href="https://mail.mozilla.org/listinfo/nightly-testers">https://mail.mozilla.org/listinfo/nightly-testers</a>
</pre>
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