How to prevent firefox hanging or crashing problem

Firefox after its latest upgrade 3.6 often hangs or crashes.But how do you control it from being crashed often?When you are performing important work on the internet if it crashes then it would be really annoying.So let me tell few steps to prevent firefox or solve the often hanging and crashing of firefox.

Clear your private data like cache and history.
Restart your system for every 4 hours.
Remove all add-ons,plugins that are not compatible with this version of firefox.
try it in safe mode.If it works properly then the problem is with your plugins.
Reinstall firefox.

These are few steps you can try to solve the often hanging or crashing problem of firefox 3.6 browser.