Well I ran Firefox 3.6 for years and it was stable as a rock. Couple of months ago, Ubuntu pushed the latest Firefox in updates. I am now running 10.0.2 on lucid and it barely lasts for couple of hours before crashing when running Gmail. I have dutifully submitted all crash reports and hope that somewhere on the 2012 roadmap, they also take care of this.
My FF was the crashiest lump of pudding ever - seriously it was crashing a few times an hour ... until I started with a new profile and moved across my various .sqlite files (eg places.sqlite, cookies.sqlite, etc.).
