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    More info about the issue: if I revert the value of
    browser.migration.version from 66 to 22 the problem with the tabs
    reappears. Changing again from 22 to 66 make it go away but exhibits
    a page saying that there was a problem restoring pages from last
    session (bellow, in Portuguese):<br>
    <br>
    <img src="cid:part1.FBDFB943.68D53918@almg.gov.br" alt=""
      width="1024" height="576"><br>
    <br>
    <br>
    <div class="moz-signature">
      <p style="font-family: 'Helvetica', 'Trebuchet MS', Arial,
        sans-serif; font-size: 16px; color: #323232; margin: 0;"><strong>Tiago
          Marques Delboni</strong><br>
        <span style="font-size:16px;">Gerência de Aplicações e Suporte a
          Clientes / GTI<br>
          (31) 2108-7700 </span></p>
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        cellpadding="0" border="0">
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          <tr>
            <td width="14%" align="left"><a
                href="http://www.almg.gov.br" title="Portal da
                Assembleia Legislativa de Minas Gerais"><img
                  src="http://mediaserver.almg.gov.br/logo-new.jpg"
                  alt="Assembleia Legislativa de Minas Gerais"
                  moz-do-not-send="true" width="164" height="48"
                  border="0"></a></td>
            <td style="padding:10px 0" width="1"><img
                moz-do-not-send="true"
                src="http://mediaserver.almg.gov.br/divisor.gif"
                opacity="50%" width="1" height="50" border="0"></td>
            <td style="padding-left:24px; font-family:'Trebuchet MS',
              Arial, Helvetica, sans-serif; font-size:11px;
              color:#393840; font-weight:bold;" width="86%" align="left">
              <a href="http://www.facebook.com/assembleiademinas"><img
                  src="http://mediaserver.almg.gov.br/facebook-assembleia.gif"
                  alt="Facebook da Assembleia" moz-do-not-send="true"
                  width="20" height="20" border="0"></a> <a
                href="http://www.twitter.com/assembleiamg"><img
                  src="http://mediaserver.almg.gov.br/twitter-assembleia.gif"
                  alt="Twitter da Assembleia" moz-do-not-send="true"
                  width="20" height="20" border="0"></a> <a
                href="http://www.instagram.com/assembleiademinas"><img
                  src="http://mediaserver.almg.gov.br/instagram-assembleia.gif"
                  alt="Instagram da Assembleia" moz-do-not-send="true"
                  width="20" height="20" border="0"></a> <a
                href="http://www.youtube.com/assembleiamg/"><img
                  src="http://mediaserver.almg.gov.br/youtube-assembleia.gif"
                  alt="Youtube da Assembleia" moz-do-not-send="true"
                  width="20" height="20" border="0"></a> </td>
          </tr>
        </tbody>
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    </div>
    <div class="moz-cite-prefix">Em 23/08/2019 13:49, Tiago Marques
      Delboni escreveu:<br>
    </div>
    <blockquote type="cite"
      cite="mid:d438199c-8e06-4486-6de5-3fdf348b4f65@almg.gov.br">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      Hi Mike<br>
      <br>
      No errors on the console and the value was not a string. <br>
      <br>
      <div class="moz-signature">
        <p style="font-family: 'Helvetica', 'Trebuchet MS', Arial,
          sans-serif; font-size: 16px; color: #323232; margin: 0;"><strong>Tiago
            Marques Delboni</strong><br>
          <span style="font-size:16px;"><br>
          </span>Em 23/08/2019 13:31, Mike Kaply escreveu:<br>
        </p>
      </div>
      <blockquote type="cite"
cite="mid:CAHueOzCKiLrC0xVi+xwZXiVCYbWn-sZZA4=-VgAYdV_2bf4YgQ@mail.gmail.com">
        <meta http-equiv="content-type" content="text/html;
          charset=UTF-8">
        <div dir="ltr">
          <div>I just tried changing my value to 22 and things still
            worked.<br>
          </div>
          <div><br>
          </div>
          <div>Can you check and see if there was an error on the
            console?</div>
          <div><br>
          </div>
          <div>Mike Kaply<br>
          </div>
        </div>
        <br>
        <div class="gmail_quote">
          <div dir="ltr" class="gmail_attr">On Fri, Aug 23, 2019 at
            11:29 AM Mike Kaply <<a href="mailto:mkaply@mozilla.com"
              moz-do-not-send="true">mkaply@mozilla.com</a>> wrote:<br>
          </div>
          <blockquote class="gmail_quote" style="margin:0px 0px 0px
            0.8ex;border-left:1px solid
            rgb(204,204,204);padding-left:1ex">
            <div dir="ltr">
              <div>That is an internal preference that shouldn't be
                messed with (it should get set automatically)</div>
              <div><br>
              </div>
              <div>The current version is actually 87 (It is not tied to
                the browser version).</div>
              <div><br>
              </div>
              <div>And an old version should work fine (unless it was a
                string for some reason)?</div>
              <div><br>
              </div>
              <div>Mike<br>
              </div>
            </div>
            <br>
            <div class="gmail_quote">
              <div dir="ltr" class="gmail_attr">On Fri, Aug 23, 2019 at
                11:24 AM Tiago Marques Delboni <<a
                  href="mailto:tiago.delboni@almg.gov.br"
                  target="_blank" moz-do-not-send="true">tiago.delboni@almg.gov.br</a>>
                wrote:<br>
              </div>
              <blockquote class="gmail_quote" style="margin:0px 0px 0px
                0.8ex;border-left:1px solid
                rgb(204,204,204);padding-left:1ex">
                <div bgcolor="#FFFFFF"> Hi all!<br>
                  <br>
                  After upgrading from ESR 52.9 to ESR 60.8, some users
                  reported that only the first tab opened in Firefox was
                  working. They can open new tabs but cannot navigate on
                  them.<br>
                  <br>
                  I've found that the problem was with the property
                  "browser.migration.version" set in
                  "%appdata%\Mozilla\Firefox\Profiles\{userprofile}\prefs.js":<br>
                  <br>
                  user_pref("browser.migration.version", 22);<br>
                  <br>
                  Removing this line or setting the value to 66 fix the
                  issue. So, how exactly does this property works? I
                  couldn't find any information about this.<br>
                  <br>
                  <div
class="gmail-m_7063921130245095030gmail-m_-9159632066346512822moz-signature">--
                    <br>
                    <p
                      style="font-family:"Helvetica","Trebuchet
MS",Arial,sans-serif;font-size:16px;color:rgb(50,50,50);margin:0px"><strong>Tiago
                        Marques Delboni</strong><br>
                      <span style="font-size:16px">Gerência de
                        Aplicações e Suporte a Clientes / GTI<br>
                        (31) 2108-7700 </span></p>
                    <table style="background-color:rgb(255,255,255)"
                      width="100%" cellspacing="0" cellpadding="0"
                      border="0">
                      <tbody>
                        <tr>
                          <td width="14%" align="left"><a
                              href="http://www.almg.gov.br"
                              title="Portal da Assembleia Legislativa de
                              Minas Gerais" target="_blank"
                              moz-do-not-send="true"><img
                                src="http://mediaserver.almg.gov.br/logo-new.jpg"
                                alt="Assembleia Legislativa de Minas
                                Gerais" moz-do-not-send="true"
                                width="164" height="48" border="0"></a></td>
                          <td style="padding:10px 0px" width="1"><img
                              src="http://mediaserver.almg.gov.br/divisor.gif"
                              moz-do-not-send="true" width="1"
                              height="50" border="0"></td>
                          <td
                            style="padding-left:24px;font-family:"Trebuchet
MS",Arial,Helvetica,sans-serif;font-size:11px;color:rgb(57,56,64);font-weight:bold"
                            width="86%" align="left"> <a
                              href="http://www.facebook.com/assembleiademinas"
                              target="_blank" moz-do-not-send="true"><img
src="http://mediaserver.almg.gov.br/facebook-assembleia.gif"
                                alt="Facebook da Assembleia"
                                moz-do-not-send="true" width="20"
                                height="20" border="0"></a> <a
                              href="http://www.twitter.com/assembleiamg"
                              target="_blank" moz-do-not-send="true"><img
src="http://mediaserver.almg.gov.br/twitter-assembleia.gif" alt="Twitter
                                da Assembleia" moz-do-not-send="true"
                                width="20" height="20" border="0"></a> <a
href="http://www.instagram.com/assembleiademinas" target="_blank"
                              moz-do-not-send="true"><img
                                src="http://mediaserver.almg.gov.br/instagram-assembleia.gif"
                                alt="Instagram da Assembleia"
                                moz-do-not-send="true" width="20"
                                height="20" border="0"></a> <a
                              href="http://www.youtube.com/assembleiamg/"
                              target="_blank" moz-do-not-send="true"><img
src="http://mediaserver.almg.gov.br/youtube-assembleia.gif" alt="Youtube
                                da Assembleia" moz-do-not-send="true"
                                width="20" height="20" border="0"></a> </td>
                        </tr>
                      </tbody>
                    </table>
                  </div>
                </div>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
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