#firma *	{ color: navy; font-size: 10pt; font-family:"Arial","sans-serif"; }
   #firma p	{	margin:0px;  }
   #firma span.nombre { font-weight: bold }
   #firma span.puesto { font-style: italic }
   #firma span.y { display: inline-block; background-color: yellow; width: 7px; height: 15px; }
   #firma span.b { display: inline-block; background-color: #000080; width: 21px; height: 15px; }
   #firma span.logo { font-size: 11pt; font-weight: bold; color: #000080; letter-spacing: 1pt; margin-left: 5px;}
   #firma div.address p span { font-size: 9pt; color: #787777; }
   #firma span.var { display: inline-block; text-align: center; width: 13px; margin-right: 5px }

Dear support: My O.S. is Ubuntu 16.04 MATE. Since an upgrade last week thunderbird crashes as soon as I open it. After some days fighting with it I've discovered a possible cause: It happens when I try to display a message with certain characteristic, I suspect it has something to do with unicode special characters. When such a mail is displayed, TB child process dies causing then mail program to crush as well. The versions of TB I've tried are 68.10.0 (64-bit) and 91.1.1 Today I tried to send an e-mail using my signature and the problem manifested again. As soon as I disablepears my signature the problem disappears. This is the signature I was using: <style> #firma * { color: navy; font-size: 10pt; font-family:"Arial","sans-serif"; } #firma p { margin:0px; } #firma span.nombre { font-weight: bold } #firma span.puesto { font-style: italic } #firma span.y { display: inline-block; background-color: yellow; width: 7px; height: 15px; } #firma span.b { display: inline-block; background-color: #000080; width: 21px; height: 15px; } #firma span.logo { font-size: 11pt; font-weight: bold; color: #000080; letter-spacing: 1pt; margin-left: 5px;} #firma div.address p span { font-size: 9pt; color: #787777; } #firma span.var { display: inline-block; text-align: center; width: 13px; margin-right: 5px } </style> <div id="firma"> <p><span class="nombre">Rafael Hern&aacute;ndez</span></p> <p><span class="puesto">Technical Consultant</span></p> <p><span>___________________________________________________________</span></p> <p><span class="y"></span><span class="b"></span><span class="logo">OPTOMATION SYSTEMS</span></p> <div class="address"> <p><span>C/ Andrés Segovia, 7. Edificio Coronado L9.</span></p> <p><span>xxxxx Las Rozas de Madrid - SPAIN</span></p> </div> <p><span class="var">&#x260f;</span><span>: +xx xxx xxx xxx</span></p> <p><span class="var">&#x1f4f1;</span><span>: +xx xxx xxx xxx</span></p> <p><span class="var">&#x1f5b7;</span><span>: +xx xxx xxx xxx</span></p> <p><span class="var">&nbsp;</span></p> <p><span class="var">&#x1f310;</span><span><a href="http://www.optomation.es">www.optomation.es</a></span></p> </div> Thank you for your time and effort, Rafael Hernandez edited phone numbers from public and search/spam bots view.