Rule out problems with your old firefox profile by creating a new firefox profile dedicated to non internet stuff
Just tried this, but didn't resolve the issue for me. In the current scenario, I am trying to launch an SSH session. I clicked the "SSH as..." button, but my typing is going to the console instead of the popup window.
Seems to be intermittent. This issue will go away, but then returns if I switch away from and then back to the XO console tab.