BitDefender and Firefox: problems. help!


I apologize for the urgency, but it is. I had to format, so I einstalled all the programs and Firefox always worked well, after I installed BitDefender AV and Firefox is no longer online. I show this page: https://www.dropbox.com/s/urk4u773ou9l23e/CatturaFirefox.JPG? dl = 0


Other browsers go online, only Firefox gives this problem. What can I do? 1000 Thanks