I keep having a pop us window appear after opening firefox. Can you help?

a pop up window appears after I open firefox. It reads: (with yellow triangle and exclamation point)
YSLOW.firefox.observer.observe()[Exception... "Component returned failure code: 0x80004001 (NS_ERROR_NOT_IMPLEMENTED) [nsILoadGroup.groupObserver]" nsresult: "0x80004001 (NS_ERROR_NOT_IMPLEMENTED)" location: "JS frame :: chrome://yslow/content/yslow-firefox-net.js :: anonymous :: line 172" data: no]
== This happened ==
Every time Firefox opened

A modal pop-up from a website code usually looks different from pop-ups from an extension that can have a real title bar.
Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
Use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed the maximum file size (1 MB).
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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