how to decrease firefox CPU usage?

[natatos]

My Mac has been lagging a bit every once and a while so I checked Activity Monitor to see why and Firefox is using 40-65 CPU and around 65 threads.
Also will Snow Leopard thread switching work on every Intel Mac or only new ones? sorry if I'm not making sense.

 

[Kyeris]

What have you been doing in Firefox to cause this usage and do you use any add-ons?

The only things (that I'm aware of) that won't work with ALL Intel Macs because they require specific hardware that not all Macs have are 64-bit and Open CL. I don't think the thread switching has anything to do with this, so it should work with all Intel macs.

 

[natatos]

What have you been doing in Firefox to cause this usage and do you use any add-ons?

The only things (that I'm aware of) that won't work with ALL Intel Macs because they require specific hardware that not all Macs have are 64-bit and Open CL. I don't think the thread switching has anything to do with this, so it should work with all Intel macs.

I have a theme add-on should I get rid of that I have probably 20 tabs that I'm going through now to try and finish what I'm doing so I can close them.

 

[Kyeris]

Any of them have any flash content? 90% of the time I would say excessive CPU usage in Firefox has Flash to blame

 

[-tWv-]

I have a theme add-on should I get rid of that I have probably 20 tabs that I'm going through now to try and finish what I'm doing so I can close them.

I have tons of add-ons in firefox and about 5 or 6 themes installed and it never uses that much CPU unless I'm doing something with flash. If you are on youtube or playing any online games, the CPU usage will spike.