Several times every day I get the following message or something very similar, what can I do? A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Scrip

Question

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.
Script: file:///C:/Program%20Files/Mozilla%20Firefox/components/nsBlocklistService.js:648
== This happened ==
Every time Firefox opened
== It just started about 2 weeks ago but is now happening every day

Answer 1

The most likely cause is a problem with Java on your system - older and/or messed up Java installations seems to cause this issue sometimes.
To fix:
Step 1: Try installing latest Java version. Check your Firefox/system browser plugins from this page, and install latest version: [http://www.mozilla.com/en-US/plugincheck/ Mozilla Plugin Check Page] (also works for most other browsers)
If latest Java (currently "Java(TM) Platform SE 6 U20 - Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers") does not fix the problem, you may have more versions installed on your system causing problems for each other. This leads us to -
Step 2: Uninstall those you can from Control Panel -> Add/Remove programs. To make sure it is properly cleaned out, see [https://support.mozilla.com/en-US/forum/1/595817#threadId608043 these excellent tips from noah_sumo] to clean out Java completely, then install latest version again from the [http://www.java.com/en/download/manual.jsp Java.com download page].
If you ''still'' get this error, you may have Norton or another security program which can also in some cases cause this issue. That takes us to:
Step 3: Configure security program correctly.
For Norton 360 see [[Configuring Norton 360]].
For Norton Internet Security, see [[Configuring Norton Internet Security]].
For other firewall programs, see [[Firewalls]].
If none of these steps solves the problem, please provide any detail you can think of that may be related and let us know, and we will try to find other solutions to get this solved.