Firefox 3.6.8 is slow on Mac OSX 10.4.11

Since upgrading to 3.6.8, I have noticed that Firefox crawls to a virtual halt immediately after clicking on links that either open or download PDF files. It doesn't freeze but just runs really really slow e.g. it will 5-10 seconds to recognise a menu click. The only way of getting out of it is to force-quit Firefox and re-open the program. All other programs running at the same time seem to run OK so it is something specific to Firefox not a general System problem. There were no such problems with earlier versions of Firefox but I did notice that all Firefox versions I have used tend to slow down the longer it is used regardless of how many windows or tabs are open. I would usually just quit and re-start after a few hours . . . but the problem mentioned above with PDF's and 3.6.8 is different.

I can't even force quit Firefox. I'm running MAC OSX10.4.11. Can't shut down computer without hard turn off on back of MAC. When I turn on again, the same frozen Firefox is on the screen. Can't escape this junk. This has happened so often that I may never use Firefox again IF I CAN EVER QUIT out of it.

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Firefox v15 and up cause my computer (MAC OSX 10.8.2) to freeze for about 30 seconds every 15-30 seconds and forces me to turn it off with the power button

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Duplicate of https://support.mozilla.org/en-US/questions/944207

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There's nothing specific about Mac OS X that would cause it to be 'slow' when networking. I (and I'm sure lots of others here as well) have many Macs owned over several years which are blazingly fast using the network.
If your network is slow, there's got to be a specific reason. We can probably help you isolate the various causes and find out what is causing it to behave so slowly.
I do not know what level of expertise you have when working with computers or networks so I will try to be specific. If we are to help you, you will need to be specific and accurate when responding. Vague answers from you will only net vague guesses from us. Specific answers from you will likely result in our being able to provide you with specific suggestions and fixes.
If the Mac is fast when running Windows, but slow when running OS X then it's not likely that you actually have a hardware defect (bad network interface, disconnected wifi antenna, etc. as these problems would manifest whether running OS X or Windows on the same hardware.
First, tell us about your Mac and your network. Which Mac model do you have? How much memory does it have? What OS version is it running? If you run "Software Update" is this Mac fully and completely up-to-date with the latest patches?
A long while back there was a known bug in Leopard that would cause a MacBook Pro to be slow if using a wireless network while on battery power (it would be fast if connected to AC power). That was patched long ago. (hence my interest in which OS revision you are running and whether it is fully patched)
What brand & model network router are you using?
What type of network connection are you using on your Mac? Are you using a physical ethernet connection (you plug in a network cable) or are you using wireless? What type of ISP do you have and what is the nature of the connection (cable, DSL, wireless, satellite?)
In "System Preferences" -> "Network", select your active network interface (typically either "Ethernet" or "Airport"), then select the "Advanced..." button in the lower right corner. On the next select the "Ethernet" tab across the top (usually the far-right). Is "Configure:" set to "Automatically"? Is the "MTU:" show a grayed out value that reads "Standard (1500)"? If not, what values do you see?
Next
Start "Network Utility" (it's under "Applications" -> "Utilities"), go to the "Info" tab, select your active network interface (probably ether "Ethernet (en0)" or "Airport (en1)").
What is the "Link Speed" of your connection?
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Next
I'd like to isolate and test the quality of the connection between your Mac and your router (ignoring the rest of the Internet). If the connection between those two components is solid and healthy, then any slow down would be a problem elsewhere in the network and not, specifically, your Mac.
There is something called "MTU" (maximum transmission unit) that I wont get into just now. A problem with MTU can cause slow delivery of packets on what should be a blazingly fast network in otherwise excellent health, but I'll set that aside for now. 99.9% of the time you should never attempt to alter the MTU.
Go into "System Preferences" -> "Network", select your network interface (either Ethernet or Airport -- whichever you happen to be using) then note the value displayed for "Router:"
Back in "Network Utility", select the "Ping" tab and type in the value displayed for your Router (which you noted above) into the box labeled "Enter the network address to ping." Usually this is a number that looks like "192.168.1.1" or "192.168.0.1" or "10.0.0.1", etc. (almost always ends with a ".1". After entering the number, verify that you have select "Send only [10] pings" (that's the default), then click "Ping" to start the test.
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Tried it.
I even reinstalled Mac OSX from scratch, and still the same problem.
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http://tenfourfox.blogspot.com/

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Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

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Edit: Steve was locking while I was replying.

Firefox 3.6.8 is slow on Mac OSX 10.4.11

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