I have been using Firefox for several version now and it has met all my needs with no problems of substance. A few weeks back I started to have Firefox crashes. They happened unpredictably and did not happen frequently so I simply kept an eye on the problem and suspected that the cause might have been related to my installation of NoScript, which was installed around the time that the problem first surfaced. The real cause of the problem, however, turned out to be the installation my AVG Free 8.0 upgrade. The AVG 8.0 link scanner component in AVG 8 has some serious conflict with Firefox. One solution is to click on Tools in Firefox and then click Add-ons. Select "AVG Safe Search 8.0", click disable and shutdown and restart Firefox.
There may be more to the problem than I mentioned here, but this has been my experience so far. I suppose this posting could be in the computer security forum as it seems to be an AVG generated problem, but the consequence is a Firefox crash so I placed it here. I did a quick search and did not see this problem mentioned, so I am assuming this is new news - my apologies if I am wrong about this.