Maybe you have an extension that is causing your crashes ... I suspect something that is not used by very many people.
As a side not I am proud to work for Mozilla. The first thing we ask before doing anything is "Will this make the internet a better place?" ... too many companies do not live their missions or, at least, don't live up to them.
It seems that any problem with Firefox results in this user-blaming. How often is one obligated to reset one's profile? If extensions make the browser slow and unstable, do you expect users never to install any? Mozilla seems to have a real problem hearing criticism about its browser. But when you push it back on the user, the truth is that a lot of people aren't going to accept that blame. They're just going to ditch your browser for something which doesn't create this sort of problem with completely normal, average usage.
There is no user blaming here. In normal circumstances Firefox is very stable so if it is crashing the fix is extremely likely to be one of the things I mentioned.
You should never have to reset your profile but if your PC (or Firefox) crashes it can cause profile issues and a reset then helps to regain stability.
The most common causes of crashes are extensions and addons. Because Firefox allows extension developers very deep integration with Firefox they can occasionally cause instabilities. Of course we want users to use extensions but occasionally one gets through that causes problems.
Most extensions do not make the browser slow and unstable, just badly written ones.
Nobody at Mozilla has problems with accurate criticisms about Firefox as it shows us where to focus in order to make the browser better.
You should probably also go to http://www.mozilla.com/plugincheck/ to update your addons.
Maybe you have an extension that is causing your crashes ... I suspect something that is not used by very many people.
As a side not I am proud to work for Mozilla. The first thing we ask before doing anything is "Will this make the internet a better place?" ... too many companies do not live their missions or, at least, don't live up to them.