This could be different in your case if you get this unresponsive script warning, but the ultimate fix to this I recommend is updating to latest version of Firefox which fixes these warnings and bugs. Firefox may give you a Warning: Unresponsive script prompt that says A script on this page may be busy, or it may have stopped responding. So I updated the Firefox 2.0 to latest version of Firefox that is Firefox 3.07, ,after that I have no warning problems in browsing Gmail and couple of Websites I mentioned above. Since this Script warning comes to me when browsing Gmail and couple of websites, I suspected Firefox, since the Firefox version using is outdated and also Firefox stopped the support to Firefox 2.0 (Only one computer in network is using Firefox 2.0 and remaining are updated one’s). Firefox may give you a 'Warning: Unresponsive script' prompt that says 'A script on this page may be busy, or it may have stopped responding. Do you want to abort the script Firefox: Warning: Unresponsive script A script on this page may be busy, or it may have stopped responding. If it continues to run, your computer may become unresponsive. You can stop the script now, or you can continue to see if the script will complete. A script on this page may be busy, or it may have stopped responding. Then after I either continue, or stop it, Firefox becomes slow, and I get the Titlebar with 'Not Responding'. The reasons could be due to Add-ons installed in Firefox or the java script in webpage you are accessing or Firefox it self. A script on this page is causing Internet Explorer to run slowly. Mozilla Firefox displays a warning that a script is taking too long to execute: 'Warning: Unresponsive script. So on two computers (one laptop, and one desktop) when on Facebook for a while, and I scroll a lot, click posts, or especially posting emojis, I start getting the warning for an unresponsive script (different ones each time). What could be the reasons that caused Firefox to give this warning ? But neither stopping the script, nor continuing the script does not yielded any favor, I got the same warning again while browsing those sites.

Warning unresponsive script firefox