Mozilla released an update for Firefox 33 on November 6th, 2014 with Firefox 33.0.3: 33.0.3: Blacklisted graphics drivers that were causing black screens with OMTC enabled 33.0.3 Fix two startup crashes with some combination of hardware and drivers For more detailed information, please see the release notes. Users may be prompted to update to the newest release of Firefox or can do so manually within Firefox by going to Help > About Firefox and following the update prompts. Users may also manually download and install the Firefox update via the getfirefox.com site. The next scheduled update for Firefox is November 25th with Firefox 34.