http://kc.mcafee.com/corporate/index?page=content&id=KB51111#Browsers was updated 2013-06-06, but the ScriptScan section appears out of date. Is IE 10, Firefox ESR 17.x and Firefox 21 supported yet? Is the ScriptScan feature updated via DATs, Engines, or VSE hotfixes and updates?
Here is the current text
Internet browser support for VSE ScriptScan
IMPORTANT: This table only relates to whether the ScriptScan feature works or is supported with the browser and not if VirusScan is supported with the browser. The versions listed below and tagged as Yes, have passed QA testing.
Browser VSE 8.8 VSE 8.7i Microsoft Internet Explorer 9 Yes 1 No Microsoft Internet Explorer 8 Yes Yes Microsoft Internet Explorer 7 Yes Yes Mozilla Firefox 7 and later4 No No Mozilla Firefox 6.x 3 No No Mozilla Firefox 5.x Yes 2 No Mozilla Firefox 4.x Yes 1 No Mozilla Firefox 3.x Yes Yes
1 Supported provided in VSE 8.8 Patch 1 and later. 2 Support provided in VSE 8.8 Patch 1 with HF625756. 3 Support is targeted to be included with VSE 8.8 Patch 2. 4 This article will be updated as new VSE products or patches are released to cover later versions of Firefox.
KB511111 still not updated with newer browser support as of September 09, 2013 revision.