Web browser processes use over 100% CPU (OS 10.6.8)

Hey, I know this problem has come up a lot in the last couple of years, but I've looked everywhere, at every thread and possible solution to my problem and none have ever worked, so as a last resort I'm going to just straight up ask bout again and hope I'm missing something.
So whenever anything on my browser is moving, wether it be Flash, HTML 5, Java or even an embedded video, on every browser I've tried from Opera to Safari and every time it will put two or three processes related to the browser up to 60%, usually amounting to over 120%. I have tried doing a fresh install of Snow Leopard, which only softened the problem for a small while. This problem, and a couple others started happening after the 10.6.8 update was installed. I have never installed Safar Extensions, I have fixed permissions, cleared caches, binned files, tried running Safari under 32-bit and 32-bit Rosetta.
Nothing works. After 20 seconds of a youtube video my macbook will freeze and ask me to hold down the power button. If I download the video through activity and play it in VLC it's fine. If I play it in Quicktime it's fine for 20 seconds and then the video stutters and slows right down before the audio stops and Quicktime refuses to play anything unless it's closed.
Among other problems caused by the update: Alt 3 is no longer hash, it just turns my cursor into a crosshair temporarily and MDS/MDworker sometimes randomly decide they're going to join in on the rogue processes for a while. I'm so close to having to sell a bunch of stuff in order to get a laptop so I can finish my uni course, it's particularly horrible knowing that I rely on my macbook for all my university work and gigs yet it's been letting me down so much.
Model Name:          MacBook
Model Identifier:          MacBook2,1
Processor Name:          Intel Core 2 Duo
Processor Speed:          1.83 GHz
Number Of Processors:          1
Total Number Of Cores:          2
L2 Cache:          2 MB
Memory:          2 GB

Oh, I posted this to the Macbook forum as it's ambiguous whether the update caused a hardware/software confliction, since a fresh install of Snow Leopard did not work.

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Premiere Pro using over 100% CPU

When I open up Premiere Pro, it is using about 6.5% CPU. I can cut, move around in the timeline and add effects ok. But when I play the video (even if its just one track with no effects) my computer starts running very hot and Premiere starts using over 500% CPU. the CPU cores heat to the 90s Celsius. Below are some specs, let me know if you need more to help answer. Thanks!!!
MacBook Pro
OS X 10.9.4
2.2 GHz Intel Core i7
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Here's while it is playing through a video...

First of all, I strongly recommend that you update to 6.0.5. You'll reap the rewards of many bug fixes. I won't venture whether that alone will help with the temperature.
As you probably know, video processing is one of the most processor-intensive activities you can ask your computer to do. Exactly how hard your CPUs will be pushed depends on at least four factors:
The type of video, namely the codec. Those that use interframe compression are much more processor-intensive than intraframe compression.
the resolution, or pixel dimensions, of the video: higher resolution = more pixels = more work
the number of layers in your sequence. And be aware that if you're using nested sequences, you need to include all the layers in each of them.
effects. Some effects like scaling and color correction require a lot of processing.
One key data point you left out regarding your computer is the graphics card. A card that supports GPU processing will take a lot of the stress off of the CPU. From the system specs you provided, I gather you're on the Late 2011 MBP. If it has a 6750M or 6770M with 1GB of VRAM, then it's supported for CS6, but not if you have the 512MB version. (Here are system requirements for CS6: System requirements | Adobe Premiere Pro)

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Lync 2013 Web APP browsers using up 100% CPU

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Message was edited by: Sn0

Thanks! I've got to leave the computer for the night, but rest assured I'll try both of your replies and label them accordingly.

Plugin-container.exe is using 90-100% CPU - even while running Firefox in safe-mode. Can I fix this?

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Firefox giving me the huge prob specially plug-in container use the 100% CPU and disconnected my internet, many time in a hour. meanwhile IE works fine no disconnection no high CPU usage. I m using 2 plug-ins grease monkey and fire bug

when i m use the FF after 20-30 minutes every site who i want to open after giving the URL in address bar and hit enter
FF status bar msg
Connecting...........
after 1 or 2 minutes plug-in container make the system heavy
on task manager > process
plug-in container 100
and task manager status bar showing 100% CPU usage.
after closing FF other browsers IE, opera work fine and smoothly

when i m use the FF after 20-30 minutes every site who i want to open after giving the URL in address bar and hit enter
FF status bar msg
Connecting...........
after 1 or 2 minutes plug-in container make the system heavy
on task manager > process
plug-in container 100
and task manager status bar showing 100% CPU usage.
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Web browser leakage uses up almost all memory

I consistently find that when using Safari (or Firefox), within a short period of time (sometimes even less than one hour), the browser has taken over nearly all available memory. This happens even when the browser is the only program in use, and when no webpages with extensive audio or video content are open.
Can someone explain to me why this happens -- i.e., why web browsers seem to hog all the memory they can find -- and (more importantly) whether I can take steps to prevent it from happening?
Thanks.
As an example, my current System Memory readings (from Activity Monitor), with only 'Firefox' and 'Activity Monitor' open, are:
Free memory . . . 74.9 MB (but frequently dropping to less than 10 MB)
Wired . . . 228.4 MB
Active . . . 1.20 GB
Inactive . . . 504.5 MB
Used . . . 1.92 GB
VM size . . . 31.99 GB
Page ins . . . 292.1 MB
Page outs . . . 120.6 MB
Swap used . . . 518.7 MB

<<< Which release of Safari are you using? Your original profile suggests you are still on OS X 10.6.3
The most recent release of Safari (5.1.7) for OS X 10.6.8 seems to keep more free RAM available (and thus offers a bit better performance with fewer beachballs) than Safari 5.0.5, the version I used extensively before recently updating to OS X 10.6.8 to get the anti-Flashback security updates. >>>
I'm actually using OS 10.6.7 (not 10.6.3). I'll update to 10.6.8 now that you've made me aware of it (thanks), but I don't see why that will make any difference regarding this particular problem.
I'll also update Safari (I'm back a few revisions on that one), but there too, I don't expect any pleasant surprises. (I don't recall ever seeing a performance improvement from an update.)
My inquiry was primarily directed at the use of the Firefox browser. However, when I've switched (in frustration) to Safari, I've seen negligible difference in performance, or regarding the particular issues I've posted about.
Even you characterized the performance gain as "a bit better." This problem cries out for much more than "a bit."
Thanks for your reply.

Completely Lost:no supporting web browser to use...

I have been without internet on my own mac for quite some time. I've been using my fiance's PC (God help me). It's been over a year since I've used the internet on my mac. I have a g3 imac with OS 9.1. I found out yesterday after having internet installed that internet explorer no longer supports upgrades. Also, my yahoo email can't be accessed because I have to upgrade to a new web browser. I tried firefox, no luck, safari isn't offered for my OS and msn is all wierd looking and then not to mention other websites that I'm used to visiting are messed up. Things are out of place and links to click on are missing...text over other text.
I've been trying all day to figure something out and I am frustrated to the point of insanity.
I've googled and searched and downloaded (with no luck). I can't even upgrade from 9.1 to 9.2.1 either. I called CompUSA where I bought my computer and they said I'll "be getting a call back and if I don't, call back and ask for Dean." I even tried the 1800 number and waited for 20 minutes before giving up.
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I have just accessed my Yahoo email with my Lombard (G3, 333 MHZ) on OS9.2 using both Netscape 7.01 and Mozilla 1.3 (wamcom). Even viewed the little bee buzzing over flowers gif my sister included. I have no reason to think they won't work with 9.1 as well. I've never been a fan of Internet Exploder anyway.
The only thing I can't get to with Netscape is my netscape.net email! That's because it was engulfed, amoeba-like, by AIM mail and offers "improvements" I had no use for. Now I have to use the iMac G5 and Firefox. Otherwise I still use Netscape, even on the G5. Things work fine. Occasionally eBay will show a "reminder" to upgrade the browser so I can use all the features, but I just dismiss it. I don't know what features I am missing, but I'm pretty sure I don't really need them.
So try Netscape.

Web browser processes use over 100% CPU (OS 10.6.8)

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