Open a Telnet link with Firefox and bad things can happen

I happened to come across a site with a number of links, and the one I chose happened to be a telnet link. Here was my experience, and I had to put myself into the shoes of the average user who knows nothing about programming.
The link that caused Firefox trouble when Firefox was chosen to run it is this:
telnet://dxc.nc7j.com:7300
Click on the link and Firefox tells you that you need to select a program to open the Internet Shortcut Shell extension DLL. I have never heard of this, and I have no idea what to do here.
Choose to open with Firefox.
Now, if some error-handling routine had caught that Firefox, which is not capable of doing Telnet, was selected by the unknowing person behind the keyboard to go ahead and do Telnet, the error-handler would advise the user to the fact that this protocol is not supported and kill the process that is going to run out-of-control otherwise. Or cause to open the program that will run the Telnet session.
Better yet, I clicked on the Telnet link and offer a better description of the choices.
After all of what happened below, I installed Iron, a Chromium-based browser, and it opened a Telnet session window right away.
So what did happen, I clicked on Firefox to do this chore and was greeted by a never-ending opening of empty tabs and upon closing the browser, it relaunched and was off to the races again. And again.
OK so this ain't getting us anywhere.
Firefox opens once again, this time hit the big red X to close it, and let the prompt to close however many tabs anyway prompt sitting there.
I chose to run CCleaner, and I set that to blow away Firefox Cache and session. Run CCleaner, and tell it to force Firefox closed when it prompts that Firefox is open.
If by chance Firefox launches again, timing was perfect that the file that was causing Firefox to open was not yet cleaned, so run the CCleaner again a few times. When Firefox is no longer opening, we are back to the world of sanity.
Now, I could go in and reset the Tools Options Applications tab and look for Telnet, and replace the use of Firefox with "ask me."
Fortunately, I know a little more than some about the computer, and I knew I had to use a utility to clear out the Firefox cache.
You have a description of the issue in your knowledgebase, but it has Firefox opening endless empty tabs, but Firefox was closed and the situation is under control.. Restart Firefox manually, start a new session and then enter the Tools menu and fix the setting.
There is a knowledge base article on this very topic, but it has the user close Firefox and then all is back to normal. One can open Firefox and get into the menu to fix the issue. There was a mention in there about malware as a possible cause of the constant reopening I experienced, but Malwarebytes scans were clean.
"Well, this is embarrassing!" I have seen that nice touch to Firefox for many years, and may I compliment those who thought of that one.

I agree, it can become a vicious circle.
The default setting to try to restore all the windows and tabs automatically after a crash isn't the best setting. Personally I do change that so I get the "this is embarrassing" screen. So one option would be to file a bug report suggesting this be changed going forward.
Another potential follow-up action would be to update the knowledge base article to better address how to recover in these situations. For example, a user could start up Firefox without restoring the previous session by:
* Launching Firefox with a specific URL
** Using a desktop shortcut
** Using a link in an external application
** On the command line, typing firefox.exe "about:blank"
** (Possibly more ways to do it)
* Renaming the sessionstore.js file in the profile folder
** On the plus side, preserves the option to restore that session later
** On the minus side, difficult for many users to find folders hidden by the OS, and the .js extension may be hidden by the OS
Since the KB is a wiki, you can go in and make edits and improvements. The syntax is a bit funky, but not much worse than this forum.

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http://img835.imageshack.us/img835/2856/clipboard05nq.jpg

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Open a Telnet link with Firefox and bad things can happen

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