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    No, you should be able to, in fact a 3 column layout should
    automatically be enforced as far as I know. It's possible an add-on
    you've installed has altered this behaviour unexpectedly. Please
    test on a new profile to see if the issue persists. If it doesn't
    then you'll need to troubleshoot what specifically in your profile
    is causing this to happen. For starters you could try the Reset
    Firefox feature in <a class="moz-txt-link-freetext" href="about:support">about:support</a>. Otherwise eliminate variables
    through a process of elimination by disabling/removing add-ons one
    by one. If it still happens on a new default profile then there
    might be a bug but I'm not seeing it on my system.<br>
    <br>
    <div class="moz-cite-prefix">On 2016-04-28 2:56 AM, Tamás Szenczi
      wrote:<br>
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    <blockquote
cite="mid:CADRgrDP-kJ7PR-9RiZ8RJS5YVbJOfz+apchzqN7Q8eOrCs8eZQ@mail.gmail.com"
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              <div>Hello everyone,<br>
                <br>
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              I was playing around this morning with the menu
              customization, and I experienced some strange behaviour:<br>
              <img alt="Szövegközi kép 1"
                src="cid:part1.08030504.09090603@mozilla.com"
                height="530" width="179"><br>
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            Is it normal if I can't place any item in a row to the third
            column? I think it should put it there automatically.<br>
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          Regards,<br>
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        Tom<br>
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                        <div style="text-align:center">"The life is like
                          an inebriate tailor: you may not know that
                          it's going to be a jacket or trousers."</div>
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      <pre wrap="">_______________________________________________
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    <br>
    <pre class="moz-signature" cols="72">-- 
Anthony Hughes
Sr. QA Engineer, Graphics
Mozilla Corporation</pre>
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