Most of developers use Firefox as their default browsers. Sometimes the browser stops working or shows some pop-up messages like the following
"Shockwave Flash may be busy, or it may have stopped responding. You can stop the plug now, or you can continue."
These types of pop ups keep on coming and hangs the browser. Most of the times such warnings are shown when the plugins of the browser are not updated.
To fix such issues go to the following link. It shows the status of your plugins and instructs you to upgrade/download plugins for your browser.
Hope this might be helpful.
Thanks for the nice suggestion. But it would be nice if you can post such technical tips in techulator.com which is a sister concern of dotnetspider.com.