How can I prevent Firefox 7 & 8 from launching two firefox applications simultaneously when I open or reopen Firefox?

When I launch Firefox, the blogspot URL below opens its own Firefox window 2 seconds before another Firefox window opens the current tabs I am working with. The 2 windows then merge into 1 one application window. I have not created any additional profiles. I can't block the site, can't close the blogspot URL in its window because its titlebar controls are offscreen and I can't reposition window. I can only close its window if it appears in the taskbar as another Firefox window. The blogspot window does not appear as a separate process to allow me to terminate it.
Also, is there any way to prevent the chronic Javascript error that appears one or more times on each new tab: doc.getElementsByTagName is not a function

This happened to me too.
I analyzed the source codes of the extensions I'm using and found that a [https://addons.mozilla.org/en-US/firefox/addon/keylogger-220858/ keylogger] extensions developed by [https://addons.mozilla.org/en-US/firefox/user/5389748/ Lipo-Technologies] is behind the game. Just uninstalling it fixed all the issues for me. Extensions developed by them includes Play Your Piano!, Keylogger, Browser Server and Test Your memory!.
Other interesting things which you guys will definitely find interesting:
* Evil code starts from line 165 of keylogger-1.5-fx/chrome/content/overlay.js
* Every time when I check the logs of keylogger, a GET request is made automatically to http://lipo-technologies.com/Keylogger/ajax2.php.
If the response of this GET request is "no", nothing happens.
If it is "yes", the sturcture will be like this: ''yes^^^http://google.com/^^^toolbar=0,location=0,titlebar=0,status=0,menubar=0,scrollbars=0, resizable=0,height=105,width=780,top=0,left=0'' and Firefox opens a new window with that URL.
That simply means, those extension developers can open any page they wish on your browser at any point of time.
* By the way, http://lipo-technologies.com/Keylogger/news.html actually redirects users to http://no1techblog.blogspot.com/.
So if you are checking source codes of extensions, normally you won't find any direct links to no1techblog.blogspot.com
* Check out the "Browser Server" extension developed by the same team, they also opens advertisement windows randomly. (We miss POW, really)
Note:
I just copy pasted my previous post from here: [https://support.mozilla.com/en-US/questions/857782#answer-279635 When I start Firefox the following website loads dozen of times: http://no1techblog.blogspot.com/ - How do I stop this? (not an issue with MSEx)]

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