Firefox is suddenly slow with APEX

Application Express 4.0.2.00.06
Linux
Oracle 11g R1
Just yesterday APEX started running very slowly in Firefox 3.6.20. It runs better in IE but has basically become unresponsive in Firefox. Has anyone experience a similar problem? I have been using this product since HTMLDB 1.5 and have never seen this behaviour before. TIA.

Here are the errors I am getting. Some seem to be related to JQuery, other to an inability to find certain functions.
Error: jQuery is not defined
Source File: http://localhost:8080/i/javascript/apex_legacy_4_0.js
Line: 1
Error: apex.item is not a function
Source File: http://localhost:8080/i/javascript/apex_legacy_4_0.js
Line: 1
Error: apex.jQuery is not a function
Source File: http://localhost:8080/apex/f?p=4550:1:2688075642206488
Line: 93
Error: submitEnter is not defined
Source File: http://localhost:8080/apex/f?p=4550:1:2688075642206488
Line: 1
Error: apex.submit is not a function
Source File: http://localhost:8080/apex/f?p=4550:1:2688075642206488
Line: 1

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