Sorry to hear you had problems with Comodo Dragon.
We have not encounter this issue before. Could you see if you can get to Facebook in safe mode.
To do that, do this you need to launch Dragon without extensions or plug-ins using --disable-extensions --disable-plugins.
Here’s how to add these options to a Dragon shortcut
Right click on your Dragon shortcut on your desktop.
Select Properties.
Add to the end of the Target field --disable-extensions --disable-plugins It will look like:
"C:\Program Files (x86)\Comodo\Dragon\dragon.exe” --disable-extensions --disable-plugins
Click on OK
Start Dragon.
Let me know if this works. If so then the problem could be an extenuation incompatibility.