If you’re using Firefox with McAfee security product installed in your Computer and if you ‘re experiencing slow browsing in Firefox 10.0.1 – blame McAfee Site Advisor add-on installed for Firefox. As Mozilla recommends users to disable this add-on that increases memory consumption of Firefox and they’re planning to block-list current add-on version 3.4.1 and contacted McAfee about the same to fix.
Disable McAfee Site Advisor add-on as it has terrible Memory Leak
“If you have the McAfee Site Advisor add-on installed in your Firefox, I recommend you disable it immediately because it has an appalling memory leak. “ Nicholas Nethercote working on Memshrink project says.
Mozilla really needs to be aggressive against these add-ons as Mozilla doing their best to get rid of Firefox performance and memory consumption issues with Memshrink project, these third-party add-ons letting them down and users.
McAfee Site Advisor and ScriptScan older versions are also block-listed by Mozilla in the past due to crashing Firefox, now same is repeating here. Mozilla not tested ScriptScan 14.4.1 though (current version) as it may comes after installing McAfee. It is better for users to disable all McAfee add-ons installed for Firefox.
You can read this bug details here.