Why is Firefox taking up a lot of CPU and running very slowly?

For the past week my Firefox (and also Chrome) have been running very slowly. Any time a page loads the CPU column in Task Manager shoots up to between 10-20 when it's usually at 00, and it sends my cpu fans into overdrive until the page is loading.
Pictures load very slowly, and busy pages are even worse, such as Weather channel pages or Gawker blog articles. I've run MSE, Malwarebytes, I've run Firefox in safe mode, nothing is working. I'm really beginning to get frustrated because it's making any kind of browsing at all very unenjoyable.

Safe Mode didn't make any difference?
Run all Windows Updates, install all needed service packs, etc.
Update your graphics driver (Firefox uses your graphics card for some rendering, and an out of date graphics card driver can cause problems. [https://support.mozilla.org/en-US/kb/how-do-i-upgrade-my-graphics-drivers https://support.mozilla.org/en-US/kb/how-do-i-upgrade-my-graphics-drivers].
Update all your plugins (Flash, Java, etc.): [http://www.mozilla.org/plugincheck/ http://www.mozilla.org/plugincheck/].

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Firefox maxing my cpu and runs VERY slow i have reset firefox and re installed it, diddnt work

firefox maxing my cpu and runs VERY slow i have reset firefox and re installed it, diddnt work i have googles searched about it and tryed so manny things to fix it but nothing works this is my last idea posting here

Did you do a clean reinstall and deleted the Firefox program folder?
*(32 bit Windows) C:\Program Files\Mozilla Firefox\
*(64 bit Windows) C:\Program Files (x86)\Mozilla Firefox\
Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.
Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Why is firefox 7b using a lot more memory and cpu on my computer?

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Is it using a significant amount more resources than 6.0 did?
I noticed 6.0 is a VAST resource hog over 5.0 and earlier. It's a very bad flaw in the new version, and has a lot of people upset.
What has me curious is whether this is a new resource problem or whether it was present in 6.0 and you are just not noticing it.
One suggestion: Don't run BETA versions of ANY software on "all your machines". Not when rolling back the version is not an option. That's generally a bad idea, since beta versions are likely to have bugs.
With FF, now, I would never let it automatically update. I don't trust their new update policies, so I would suggest you turn "auto updates" to OFF, and do it manually, only after you hear the new release is stable, which we know 6.0 is NOT.

Process "bird" taking up to 140% of CPU and running constantly

Mac OS X 10.10.1 Yosemite/iMac mid-2011
My iMac is really slow to start-up, to run, and to have applications run. I have 32 GB memory, 113 GB hard disk capacity and it has never been slower in its life. There is a process called "bird" that is running almost constantly whenever I run Activity Monitor and it is taking up to 140% of CPU time. What is "bird"? Why is it running constantly and eating up so much CPU time? Why is my iMac so slow running Mac OS X 10.10.1 Yosemite?
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Once it’s enabled iCloud Drive starts working automatically, syncing data between your devices in the background (slowing your iMac down). Unlike the first version of iCloud, iCloud Drive can be be accessed in the Finder like other folders. You can store any type of file in iCloud Drive provided it is less than 15 gigabytes in size. When it’s enabled, it will show up in the side column of a Finder window. iCloud Drive is not as advanced and widely accessible and supported as Dropbox, but it’s useful if you work and share documents between your iOS and Mac devices. The service should improve further.

HT4623 After I updated my iPad using my computer, it has started to lag a lot and run very slowly. Why is it doing this and is there any way to make it stop lagging?

I updated my iPad mini last night using my laptop (I usually update it on the iPad itself) and after the update, the iPad has been slow and laggy ever since. When I try to type something, it freezes up and may not actually show that i typed it for another minute or two. Even if I close all my apps and restart it, the problem is still there. Does anybody know what's going on and/or how to solve this problem?

Try Settings > General > Reset > Reset Keyboard Dictionary

Since updating Firefox to the current version it takes a long time to start up and runs VERY slowly no matter what time of day i log in. Help, please!

I am running Windows XP. It takes more than a minute to bring up the home page and about the same time to bring up any search results. Firefox used to run much more quickly - just a few seconds at most to open program.

Thanks for the help! Here is the information:
Model Name:          iMac
Model Identifier:          iMac12,2
Processor Name:          Intel Core i5
Processor Speed:          2.7 GHz
Number of Processors:          1
Total Number of Cores:          4
L2 Cache (per Core):          256 KB
L3 Cache:          6 MB
Memory:          4 GB
Boot ROM Version:          IM121.0047.B1F
SMC Version (system):          1.72f2
Serial Number (system):          C02FME0RDHJP
Hardware UUID:          2364D9F3-FB16-5F4E-87FC-F002F10BC21D
AMD Radeon HD 6770M:
Chipset Model:          AMD Radeon HD 6770M
Type:          GPU
Bus:          PCIe
PCIe Lane Width:          x16
VRAM (Total):          512 MB
Vendor:          ATI (0x1002)
Device ID:          0x6740
Revision ID:          0x0000
ROM Revision:          113-C0170F-170
EFI Driver Version:          01.00.544
Displays:
iMac:
Display Type:          LCD
Resolution:          2560 x 1440
Pixel Depth:          32-Bit Color (ARGB8888)
Main Display:          Yes
Mirror:          Off
Online:          Yes
Built-In:          Yes
Connection Type:          DisplayPort
Just 1 terabyte hard drive with >200 gig left
No external hard drive and all connected internally
Media=final cut pro x

Since I switched to Firefox 5.0, my Bejeweled Blitz game is running very slowly!! Is Firefox 5.0 the problem???

I have tried to get help on Bejeweled Blitz site but no answer. Could the Firefox 5.0 be incompatible with the Bejeweled Blitz game on Facebook??

You can't use code in userChrome.css to make changes to the Bookmarks menu on a Mac.<br />
On a Mac the OS creates and maintains the menu bar (incl. the Bookmarks menu) and Firefox doesn't have control over the menu bar, so you can't style that menu via userChrome.css.<br />
You can style the drop down menu of the Bookmarks Menu button.
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* Bookmarks > Show All Bookmarks

Npviewer.bin (on linux) eats lots of CPU and doesn't even close when firefox is closed.

npviewer.bin (on linux) eats lots of CPU and doesn't even close when firefox is closed.

I've begun having this problem as well. Reviewing the above, I seen no errors that I' making. A few weeks ago, without being aware of an update to Firefox, it began behaving differently than it has for years. I've always had it set to open to an empty tab, now it often opens to the 'Firefox Home Page' (which I've never used)... this despite resetting my opening page to "Show my windows and tabs from last time" (upon troubleshooting the 'home page issue' I found that the opening page had reset to FF Home somehow. I store a lot of pages in tab groups and having them disappear is a major bummer since they're news articles I'm waiting to copy.
Also... I run CCleaner weekly and I know that will erase the group tabs I've stored so before running it I have to store those URL's another way. Does anyone know what I can uncheck in CCleaner to keep those tabs?
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After automatic update of Firefox 3.6, it is now running VERY slowly!

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== This happened ==
Every time Firefox opened
== Yesterday,Tuesday, June 22, 2010

I installed 3.6.4 on XP June 23 and had much the same experience, except Firefox 3.6.4 never finished opening, even after nearly an hour, and brought my entire system to an excruciatingly slow crawl, even though pgm mgr showed FF getting 0% and system idle with 97-98. This happened twice with a reboot in between. Finally had to roll back to a previous restore point and all is fine now, except--no new version of Firefox. I'll wait to see more feedback about 3.6.4 before trying to install again.

Why when I open multiple tabs in Facebook, the tabs load very slowly and most times don't load at all?

Why when I open multiple tabs in Facebook, the tabs load very slowly and most times don't load at all?

The default of the pref network.http.max-connections has been increased from 30 to 256 in Firefox 6+ versions.
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*https://support.mozilla.com/kb/Firefox+never+finishes+loading+certain+websites

MacBook Pro running very slowly, with lots of pinwheeling, especially in Safari

Here's the Etrecheck report:
Problem description:
Mac is running very slowly…especially Safari…lots of pinwheel time.
EtreCheck version: 2.1.8 (121)
Report generated March 17, 2015 5:16:05 PM EDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (13-inch, Mid 2012) (Technical Specifications)
    MacBook Pro - model: MacBookPro9,2
    1 2.5 GHz Intel Core i5 CPU: 2-core
    4 GB RAM
        BANK 0/DIMM0
            2 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless: en1: 802.11 a/b/g/n
    Battery Health: Normal - Cycle count 299
Video Information: ℹ️
    Intel HD Graphics 4000 - VRAM: 512 MB
        Color LCD 1280 x 800
System Software: ℹ️
    OS X 10.8.5 (12F45) - Time since boot: 22:59:8
Disk Information: ℹ️
    APPLE HDD HTS545050A7E362 disk0 : (500.11 GB)
        disk0s1 (disk0s1) <not mounted> : 210 MB
        Macintosh HD (disk0s2) / : 499.25 GB (438.20 GB free)
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
    MATSHITADVD-R   UJ-8A8
USB Information: ℹ️
    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Computer, Inc. IR Receiver
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Library/Application Support/Kaspersky Lab/KAV/Bases/Cache
    [loaded]    com.kaspersky.kext.kimul.44 (44) [Click for support]
    [loaded]    com.kaspersky.kext.mark.1.0.5 (1.0.5) [Click for support]
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    [failed]    com.apple.pbs.plist [Click for details]
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Launch Agents: ℹ️
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        Total number of backups: 9
        Oldest backup: 2013-09-10 23:44:06 +0000
        Last backup: 2015-03-16 15:01:07 +0000
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Top Processes by CPU: ℹ️
         2%    kav
         1%    WindowServer
         0%    Safari
         0%    WebProcess
         0%    kav_agent
Top Processes by Memory: ℹ️
    1.10 GB    Safari
    558 MB    WebProcess
    129 MB    kav
    86 MB    Mail
    30 MB    WindowServer
Virtual Memory Information: ℹ️
    450 MB    Free RAM
    1.38 GB    Active RAM
    1.31 GB    Inactive RAM
    1.15 GB    Wired RAM
    4.22 GB    Page-ins
    4.50 GB    Page-outs
Diagnostics Information: ℹ️
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When you see a beachball cursor or the slowness is especially bad, note the exact time: hour, minute, second.
These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad and start typing the name.
The title of the Console window should be All Messages. If it isn't, select
          SYSTEM LOG QUERIES ▹ All Messages
from the log list on the left. If you don't see that list, select
          View ▹ Show Log List
from the menu bar at the top of the screen.
Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.
Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.
Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.
Please don't indiscriminately dump thousands of lines from the log into this discussion.
Please don't post screenshots of log messages—post the text.
Some private information, such as your name, may appear in the log. Anonymize before posting.

Why does Firefox 4 not open video files (news and youtube) at all, but Firefox 3 and MSIE 8 open these video files quickly, all on my Dell Dimension 8250 desktop with MS Windows XL Pro?

I subscribe to an Earthlink package of telephone and ISP through DSL in Dallas, Texas. To avoid the congestion (time outs and files not found) of the virtual "cloud" servers, as a workaround I connect to the Internet through dial-up on each session on my pc. There is only one pc or computer on my local network. I downloaded Firefox 4 RC and it failed (would not open video files on the Internet), so I removed the Firefox 4 RC program from my pc, and then I downloaded and installed Firefox 3.6.16, which works fine.
My operating system is Windows XP Pro.

Try disabling hardware acceleration. Many visual bugs can be attributed to issues with graphics drivers.
(Firefox -> Options -> Advanced -> General -> [ ] Use hardware acceleration when available)

Why is Firefox 3.6 soooo slow to load and start?

I recently upgraded my version to 3.6 - as advised on your website when I saw a newer version was available. However it takes ages to load up and start. It can take at least 5 minutes to start up! Driving me to start using IE!!! I have uninstalled and re-installed from your website several times and it doesn't change anything. I have used a new profile and still the same! Occasionally after 10 mins it comes up with a dialog box say Firefox can;t find or is having trouble running a script. After first seeing this I uninstalled and reinstalled again as I thought it had become corrupt. But after doing this several times it is still the same old slow Firefox! And I thought new versions were supposed to improve things!
== This happened ==
Every time Firefox opened
== When I upgraded to the latest 3.6 version

Your Firefox settings and info are kept in a folder separate from the Firefox program, called your profile folder. Try creating a test profile, to see if the problem still occurs. See [[Managing profiles]]or One of your add-ons might be the culprit too. Try running Firefox in [[Safe Mode]] with all add-ons disabled. If that solves the problem, see [[Troubleshooting extensions and themes]] and possibly [[Troubleshooting plugins]]

Apple Mobile devices and Itunes is taking up 100% of my CPU and I can not get to the Itunes music store on 10.5

I have installed the 10.5 version of the Apple Itunes app. Now when I bring it up it takes up one whole CPU and my other CPU is used up by Apple Mobile devices. I am using Windows XP Service Pack 2. I have tried uninstalling all Apple products and reinstalling them but with no luck. Please if anyone has any advice I am all ears...

Thanks, Andrew for your help. Not sure if you will see this, but I did the above and it said the HD was okay. Rebooted it and still won't go past login page. Tried it again and this time typed in the line /sbin/fsck -fy and then it came up and said HD was okay, but said something about being modified. I once more rebooted, but it still won't get past the login screen. Besides taking long to reboot, as before, I am able to enter my password, but then it hangs up with the rainbow icon rotating continuously. Does this mean that the disk is corrupt or partially so, and if so, can you advise how I should proceed? TIA again.

FCE is running very slowly lately, freezing a lot...

I have about had enough! It use to not be this way... why is it running so slowly and freezing? Do I need to re-install FCE? or would I lose my projects if I did that?
Help!

Before you reinstall FCE you should try trashing the preferences like this:-
http://www.fcpbook.com/Misc1.html
These documents will show how to uninstall FCE:-
FCE 1 + 2 http://docs.info.apple.com/article.html?artnum=93688
FCE 3, 3.5 and 4 http://docs.info.apple.com/article.html?artnum=301182
Also think about any updates, upgrades or installations you have recently made on your computer that might account for the poor performance.

Why is Firefox taking up a lot of CPU and running very slowly?

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