I previously mentioned that my only issue with Firefox relates to excessive memory usage. I love Firefox, and I have been willing to put up with the occasional memory leak.
However, here is a great resource that provides details about the Firefox memory leaks along with some solutions and workarounds.
For example, one of my favorite extensions, Forecastfox, which displays a mini weather report in my toolbar, is a “known leaky extension” that may be the source of some of my problems. A number of tweaks are also available that allow you customize how Firefox uses memory. I encourage anyone experiencing memory issues to read this thread.