You can disable the tab bar with a "user chrome" file such as https://github.com/cmcaine/tridactyl/blob/master/src/static/userChrome-minimal.css https://github.

You can disable the tab bar with a "user chrome" file such as https://github.com/cmcaine/tridactyl/blob/master/src/static/userChrome-minimal.css https://github.com/cmcaine/tridactyl/blob/master/src/static/... (instructions at top of file). Mozilla is making noises about disabling this eventually, but it works for now.