Mozilla released an update for Firefox 33.1 on November 14th, 2014 with Firefox 33.1.1:
33.1.1 – Fixed startup crash (see bug 1021265)
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.