Ever since Firefox 18.0.1 was released part of the web browsers user base experienced crashes on the worlds most popular social networking site Facebook. From Ghacks:

It took Mozilla some time to figure out what was going on. You can go through the original bug listing over at Bugzilla for more information. First signs of the bug appeared on December 30, 2012 when it jumped to the 32th spot of the top browser crasher listing that Mozilla maintains.

At the end of January, the bug accounted for almost 18% of all crashes in Firefox 18.0.1 which is a very large number for a single crash.

 Firefox 18.0.2 will resolve crashes when on Facebook