What is happening when firefox reports (Not Responding)?

More often than I'd like (at least a dozen times per day) Firefox goes non-responsive and reports (Not Responding) in the banner. (In fact it happened while I was trying to access this page!)
Does mozilla have any tools/add-ons that I could install that Firefox could activate when this happens to try to diagnose the problem? i.e. when the banner is updated to display (Not Responding), could firefox also do things like:
- ICMP ping the proxy server (if there is one) to see if it is a local network problem.
- ICMP ping the destination website in question to check end-to-end network latency.
- setup an HTTP connection (wget?) to the proxy server (if there is one) to see if the proxy server is the bottleneck?
- setup an HHTP connection(wget?) to the destination website to measure the response time for a new connection?
Etc.

"Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"<br />
"Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"<br />
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
There is also security software (firewalls) that can cause such issues, so you may need to look there as well.

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