Why Firefox 4 has short freezes and operates sluggish?

While using FireFox 4, the program is really sluggish and it take some 3-5 seconds and even longer for it to respond to a command at times. This is a continuous problem that happens almost every click. than with the scrolling of a page, when you have something that is fairly long, and your scrolling down the page, either with dragging the bar or using the scroll bar. the page will just freeze up for some times up to 8-10seconds than all of a sudden start scrolling again for half a window before it does it again. I have uninstalled and re-installed Firefox 4, as while as my Ubuntu OS 10.10 and than again twice when I upgraded to 11.04 thinking that was a problem. I prefer Firfox over another browser but have been using Chrome to do things cause it does not have these issues. No other programs exhibit this problems other than firefox 4 which is that the best browser design I have seen and fits my needs well.

See how it is with a new Profile. <br />
http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows

Similar Messages

Within the last week my firefox browser has been freezing and loading a lot of pages. Very slow. I've uninstalled, I was getting a yahoo search. I've set the i

I have been a firefox user for 15 years. lately my browser has become really slow and freezes everytime. my bing and google browsers are not having problems

Hello,
The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information such as bookmarks and History.
Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.''
To Reset Firefox do the following:
#Go to Firefox > Help > Troubleshooting Information.
#Click the "Reset Firefox" button.
#Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
#Firefox will open with all factory defaults applied.
Further information can be found in the [[Reset Firefox – easily fix most problems]] article.
Also try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
Then perform these steps:
*Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
*In the Firefox options window click the ''Advanced'' tab, then select "General".
*In the settings list, you should find the ''Use hardware acceleration when available'' checkbox. Uncheck this checkbox.
*Now, restart Firefox and see if the problems persist.
Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:
* [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]
* [[Upgrade your graphics drivers to use hardware acceleration and WebGL]]
Did this fix your problems? Please report back to us!
Thank you.

Why FireFox Doesn't have Paste and go like other Browsers?

Why FireFox Doesn't have Paste and go like other Browsers?
This Is The One Thing Missing From firfox Other Than That
It Is a Great Browser

You're welcome.
You can download the beta, but you should remember that it is still a beta version and that there are still bugs that need to be resolved. The beta versions are released as test versions to make it possible to get as many bugs fixed as possible before the final release.
Make sure that you create a new profile exclusively for the 4.0 beta version and create a desktop shortcut with -P "profile" appended to the target to launch that profile to avoid the beta version from corrupting the Firefox 3.6.x profile.<br />
The Firefox beta version install by default in their own program folder and do not replace the currently installed Firefox 3.6.x release.
* http://kb.mozillazine.org/Testing_pre-release_versions
* http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
* http://kb.mozillazine.org/Shortcut_to_a_specific_profile
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox

Firefox 5 has just downloaded and it is not compatible with my google toolbar, so I cannot easily have my icons etc . Please sort this out.

Firefox 5 has just downloaded and it is not compatible with a google toolobar, so I cannot have the icons present as before. This is very annoying.

This was also asked here: https://support.mozilla.com/en-US/questions/837142
Google Toolbar is an addon, and every addon has a maximum version number set by the addon developers. Google Toolbar apparently is compatible with Firefox 5, and the only reason it doesn't work is because the Google developers have not updated their toolbar's maximum version number. You can either wait for them to do so, or follow the directions at the link above to change the number yourself.

HT6001 my mac has started freezing and suddenly shutting down on me it seems as if every process has slowed down since downloading this last update of 11.1.4, any solutions? Because it shut down in the middle of a test twice now, saying keyboard issue.

my mac has started freezing and suddenly shutting down on me it seems as if every process has slowed down since downloading this last update of 11.1.4, any solutions? Because it shut down in the middle of a test twice now, saying keyboard issue.

What you describe sounds like a hardware issue. Unfortunately, you'll need to get that checked out by Apple. If you have an Apple Store near you, make an appointment with the Genius Bar and take the machine in for evaluation.

Why does my MacBook pro freeze and how do i stop it?

Hello
I have recently bought a new MacBook Pro, late 2011 13'' 2.4 GHz. It has started freezing alot. I don't know if it needs more RAM, a problem with the hard drive or faulty application. So I was just wondering if anyone could give me advise on how to stop it and why its happening.
Thanks

Is this very recent? Did you install the new Thunderbolt/Ethernet update?
Clinton

HT201412 why does my iphone keep freezing and when i keep going on to settings it comes up blank and shuts down the app

i would like to know why my iphone 4s keeps freezing alot and everytime i go on settings it goes blanks and shut the app down?
i cant use setttings at all

Why? Not sure, could be lots of different reasons.
However, if you'd like to know how to fix the issue, then have you tried the troubleshooting steps listed inthe article that you linked from?
When in doubt: Restart, Reset, Restore from Backup, Restore as New.

My Ipad screen has been freezing and now the ipad will not charge

My Ipad screen has been freezing up and now will not charge

Not charging
1. Reset iPad; hold the Sleep/Wake and Home button down until you see the Apple Logo
2. Try another wall socket
3. Try another cable (make sure it's an original Apple cable)
4. Try another charger (make sure it's an original Apple charger)
5. Clean Lightning port with compress air or new paint brush

Why does my ipod keep freezing and skipping songs?

I have the 80GB Ipod Classic, and for some reason it keeps skipping songs, for instance, whenever I go to look under a certain artist or a playlist of even just under "songs" I'll pick one and then it will skip one or two or ten, and there are some songs it just doesn't allow me to listen to anymore. Only on my ipod though, not on itunes. It also keeps freezing and will sometimes just stop in the middle of a song and skip to a new one. I've tried resetting it, and leaving it alone for a few days and letting it charge and leaving it off. Nothing seems to work.
What can I do?

I had this problem with my old 20GB classic ipod, it all started when I began using my ipod for my running trainings, every day it used to get worse freezing every 10 minutos or so, then I got ****** and bought a new 80GB classic Ipod, I have it for about 3 weeks now and guess what? It started freezing or skiping songs also. I did a test where I synced the same library on my both ipod and the songs being skipped on my new one wasnt being skipped on the old one, so its a problem with the song, then I though it could be any damage in the ipod HD but my new ipod has no reason to be damaged, the only impact that it might have recived is from my running trainings, but the impacts are really weak. Other test I did was trying to remove the song being skiped from the ipod, everytime I did that my ipod couldnt be ejcted, it kept showing me the following message "The ipod canot be ejcted because it contains files that are used by another aplication." I had to unplug my ipod without ejecting it.

Firefox crashes or just freezes and each time I close it, I have to type all the websites again - it does not memorize them as the previous version did?

The latest version of Firefox looks great, but some new problems began appearing:
-sometimes it crashes or just freezes and nothing can be done, it just says Not Responding
-each time I close all the tabs I always put - Save option so that next time all the tabs are there, but with the new version I never get all the tabs from the previous session, but only the blank or home page?

Restart your computer and try again.
Double check your AppleMenu()>System Preferences>Trackpad
for all custom settings here.

Why does my iTunes window freeze and wont close until i shut my computer down, when the "iTunes is not the default media player" message appears? and how do i fix this? i just want to fix my music, but it freezes and i can't use my computer correctly.

when i plug my iPod into my computer, iTunes opens as normal, but for a while it's been giving me a message that says "iTunes is not the default media player" and after i 'tried' to do that, i'll close the settings window and my iTunes window will freeze and not close, reload, or anything. and if i "open drvice to view files" that window will freeze too, the internal storage window. i can't get iTunes to close with ALT+F4, or right clicking the tab on the bottom of the screen to close it, or clicking the 'X' button. the only way it closes is when i shut down my computer. please help me fix this. Its getting Really Really tiring having to restart my computer over and over.

What Windows version?

Why have byteValue in Short, Integer and Long?

What good is the method byteValue() in Short, Integer and Long? It really only makes sense in Byte. This only helps if you are only interested in downcasting your number to a byte. It seems to me Number should also implement toByteArray() or something since all of the subclasses could at least return an array with one element.
Maybe we should just have a method toChar() with no args in String and do away with toCharArray()!?
Please help me out if I am missing something here.
MR

yeah, a toByteArray() method would be pretty damn useful!
a little query regarding byteValue() it says it may involve rounding or truncation, but in none of the subclasses does it specify which of these will occur ;/
would a short with the value 00000000 11111111
be returned as 01111111(rounded) or 11111111(truncated)?
rob,

Seemingly random freezes and general sluggishness.

Since I have updated to Snow Leopard my 20" iMac seems to be having some issues. various applications stall (iTunes, FireFox, iPhoto) or completely freeze seemingly at random. Not enough to prohibit use of the machine but often enough to cause concern. I have run DiskUtility to repair permissions, I have cleared out my cache files using Onyx but these stalls and crashes still seem to persist.
I have posted the log from a single start up below. A few start up errors caught my attention but I admit I really do not completely understand what I am reading.
_*Could not find: com.apple.ReportCrash.Self:*_ seems this would be console log related
MenuCracker: There seem to be 3 errors in the log related to MenuCracker I have read that this is installed with some software but I am not sure what. I did have "Connect360.prefPane" and "MediaLink.prefPane" set to show their icons in the menu, but this error still persists after I set them to not do so.
Any assistance would be very much appreciated. Thank you.
*LOG from Start up:*
4/23/10 8:37:30 AM com.apple.launchd[1] * launchd[1] has started up. *
4/23/10 8:37:52 AM com.wacom.wacomtablet[83] TabletDriver[83]: Finish launching /Library/Application Support/Tablet/WacomTabletDriver.app/Contents/Resources/TabletDriver.app
4/23/10 8:37:52 AM com.apple.launchd.peruser.501[90] (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
4/23/10 8:37:52 AM com.apple.launchd[1] (com.wacom.wacomtablet[83]) Exited with exit code: 255
4/23/10 8:37:53 AM SystemUIServer[95] Error loading /Users/calvin/.webex/825/Sharing.app/Contents/Resources/WebexAppshare.menu/Cont ents/Resources/MenuCracker.menu/Contents/MacOS/MenuCracker: dlopen(/Users/calvin/.webex/825/Sharing.app/Contents/Resources/WebexAppshare.me nu/Contents/Resources/MenuCracker.menu/Contents/MacOS/MenuCracker, 265): no suitable image found. Did find:
/Users/calvin/.webex/825/Sharing.app/Contents/Resources/WebexAppshare.menu/Cont ents/Resources/MenuCracker.menu/Contents/MacOS/MenuCracker: no matching architecture in universal wrapper
4/23/10 8:37:53 AM SystemUIServer[95] failed to instantiate and get the principal class of bundle: NSBundle </Users/calvin/.webex/825/Sharing.app/Contents/Resources/WebexAppshare.menu/Con tents/Resources/MenuCracker.menu> (not yet loaded)
4/23/10 8:37:54 AM com.apple.launchd.peruser.501[90] (com.apple.Kerberos.renew.plist[123]) Exited with exit code: 1
4/23/10 8:37:54 AM com.wacom.wacomtablet[126] TabletDriver[126]: Finish launching /Library/Application Support/Tablet/WacomTabletDriver.app/Contents/Resources/TabletDriver.app
4/23/10 8:37:55 AM Dock[94] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
4/23/10 8:37:55 AM [0x0-0xc00c].com.kensington.mouseworks.background[131] Kensington FastUserSwitch: Session On Console
4/23/10 8:37:55 AM [0x0-0xc00c].com.kensington.mouseworks.background[131] Kensington FastUserSwitch: Session User ID = 501
4/23/10 8:37:55 AM [0x0-0xc00c].com.kensington.mouseworks.background[131] Kensington FastUserSwitch: Installing User Switch Notifications
*Resent Crash Log:*
4/22/10 9:07:41 AM [0x0-0x1d01d].com.apple.CharacterPaletteIM[182] objc[182]: Class ThinDividerSplitView is implemented in both /System/Library/Input Methods/CharacterPalette.app/Contents/MacOS/CharacterPalette and /System/Library/Input Methods/CharacterPalette.app/Contents/PlugIns/RomanView.CharPalettePlugin/Conte nts/MacOS/RomanView. One of the two will be used. Which one is undefined.
4/22/10 9:08:05 AM com.apple.WindowServer[64] Thu Apr 22 09:08:05 CCNIII-3.local WindowServer[64] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
4/22/10 9:39:51 AM Finder[92] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
4/22/10 6:23:39 PM [0x0-0x3a03a].com.adobe.Photoshop[864] Adobe Photoshop CS4(864,0xa0b3c4e0) malloc: * error for object 0x4b00690: Non-aligned pointer being freed (2)
4/22/10 6:23:39 PM [0x0-0x3a03a].com.adobe.Photoshop[864] * set a breakpoint in mallocerrorbreak to debug
4/22/10 6:23:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] Adobe Photoshop CS4(864,0xa0b3c4e0) malloc: * error for object 0x4b05cf0: Non-aligned pointer being freed (2)
4/22/10 6:23:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] * set a breakpoint in mallocerrorbreak to debug
4/22/10 6:23:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] Adobe Photoshop CS4(864,0xa0b3c4e0) malloc: * error for object 0x4b06280: Non-aligned pointer being freed (2)
4/22/10 6:23:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] * set a breakpoint in mallocerrorbreak to debug
4/22/10 6:23:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] Adobe Photoshop CS4(864,0xa0b3c4e0) malloc: * error for object 0x4b06300: Non-aligned pointer being freed (2)
4/22/10 6:23:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] * set a breakpoint in mallocerrorbreak to debug
4/22/10 6:23:50 PM [0x0-0x3a03a].com.adobe.Photoshop[864] file://localhost/Applications/Adobe P
4/22/10 6:32:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] Adobe Photoshop CS4(864,0xa0b3c4e0) malloc: * error for object 0x493c9f0: Non-aligned pointer being freed (2)
4/22/10 6:32:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] * set a breakpoint in mallocerrorbreak to debug
4/22/10 6:32:41 PM [0x0-0x3a03a].com.adobe.Photoshop[864] file://localhost/Applications/Adobe P
4/22/10 7:30:07 PM com.apple.launchd[1] (com.wacom.wacomtablet[1031]) Exited with exit code: 255
4/22/10 7:30:22 PM com.apple.launchd.peruser.501[86] (com.apple.pbs) Throttling respawn: Will start in 10 seconds
4/22/10 8:58:07 PM com.wacom.wacomtablet[1306] TabletDriver[1306]: Finish launching /Library/Application Support/Tablet/WacomTabletDriver.app/Contents/Resources/TabletDriver.app
4/22/10 8:58:16 PM SystemUIServer[91] Apple80211GetInfoCopy returned error: -3900
4/22/10 8:58:16 PM com.wacom.wacomtablet[1306] objc[1306]: task_thread failed (result -301)
4/22/10 8:58:22 PM com.apple.ReportCrash.Root[1314] 2010-04-22 20:58:22.803 ReportCrash[1314:2903] Saved crash report for WacomTabletDriver[1306] version ??? (???) to /Library/Logs/DiagnosticReports/WacomTabletDriver2010-04-22-205822localhost.crash
4/23/10 6:43:44 AM [0x0-0x6a06a].backupd-helper[1340] Not starting Time Machine backup after wake - failed to resolve alias to backup volume
4/23/10 6:47:23 AM DashboardClient[1457] com.apple.widget.dictionary: com.apple.dictionary.NOAD
4/23/10 6:47:23 AM com.apple.Dock.agent[90] 2010-04-23 06:47:23.108 DashboardClient[1457:a03] com.apple.widget.dictionary: com.apple.dictionary.NOAD
4/23/10 6:50:57 AM [0x0-0x1b01b].org.mozilla.firefox[166] Debugger() was called!
4/23/10 7:44:18 AM Finder[92] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
4/23/10 8:11:54 AM iTunes[1946] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
4/23/10 8:11:54 AM iTunes[1946] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
4/23/10 8:11:54 AM [0x0-0x78078].com.apple.iTunes[1946] Fri Apr 23 08:11:54 CCNIII-3.local iTunes[1946] <Error>: doClip: empty path.
-------------------

I finally tracked down where MenuCracker was hiding as an invisible file:
/Users/calvin/.webex/825/Sharing.app/Contents/Resources/WebexAppshare.menu/Conte nts/Resources/MenuCracker.menu/Contents/MacOS/MenuCracker
The key for me was ".webex/825/Sharing.app" WebEx is a service by Cicso the company I work for uses for web based meetings. (www.webex.com)
I had no luck finding an uninstaller from them so I did a search for invisible files. Amazing how many of those there are!
Sure enough there was the .webex folder with a bunch of stuff they installed, probably about 2 years a go when I first use the service. This included this "Sharing.app" file that must have been loading on start-up and utilizing the MenuCracker hack.
First I moved this to the trash. But because it was invisible this did not show up there and did not set the trash menu to allow emptying. Besides, I thought to myself, I should not just immediately delete it just-in-case. So I made a new visible folder on my desktop and moved it there.
I then restarted and pulled up console to review the start-up log. Sure enough MenuCracker has now been removed:
LOG: after " .webex" directory removal
5/2/10 8:50:37 AM com.apple.launchd[1] * launchd[1] has started up. *
5/2/10 8:51:01 AM com.wacom.wacomtablet[80] TabletDriver[80]: Finish launching /Library/Application Support/Tablet/WacomTabletDriver.app/Contents/Resources/TabletDriver.app
5/2/10 8:51:01 AM com.apple.launchd[1] (com.wacom.wacomtablet[80]) Exited with exit code: 255
5/2/10 8:51:01 AM com.apple.launchd.peruser.501[87] (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
5/2/10 8:51:03 AM com.apple.launchd.peruser.501[87] (com.apple.Kerberos.renew.plist[113]) Exited with exit code: 1
5/2/10 8:51:04 AM [0x0-0xb00b].com.kensington.mouseworks.background[120] Kensington FastUserSwitch: Session On Console
5/2/10 8:51:04 AM [0x0-0xb00b].com.kensington.mouseworks.background[120] Kensington FastUserSwitch: Session User ID = 501
5/2/10 8:51:04 AM [0x0-0xb00b].com.kensington.mouseworks.background[120] Kensington FastUserSwitch: Installing User Switch Notifications
5/2/10 8:51:04 AM com.wacom.wacomtablet[116] TabletDriver[116]: Finish launching /Library/Application Support/Tablet/WacomTabletDriver.app/Contents/Resources/TabletDriver.app
5/2/10 8:51:05 AM Dock[91] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary.
END LOG
Time will tell if this solves my random freezes. I will give it some time to see and report back my findings to see if indeed this hack was causing my issues.
Thanks to all for the input as well as the side banter about Snow Leopard. That has gotten very entertaining. I understand people are frustrated with an upgrade that causes them problems but to get that perfect world Apple would only allow us to use Apple sanctioned software so that they could test permeation of software/hardware to be sure these things didn't happen. Do you really want that? This is exactly what people are complaining about with the iPhone and iPad. you can't have it both ways now can you.
—Nivlac Noslen

Firefox 29 has, this morning and for no apparent reason, stopped recognising 2 and 3 fingure trackerpad gestures. Why?

Currently running Mavericks in Mac computer with Firefox 29 Beta. Software has not updated for a couple of days and no changes have been made to the configuration in any way for at least a week.
Everything working normally yesterday but, this morning, all two and three finger gestures on my trackerpad had stopped working. This is not happening on any other application on my system so must, therefore, be a firefox issue.
Would appreciate any suggestions

Yup, they are are working on this and the team is aware of this issue.
* [https://bugzilla.mozilla.org/show_bug.cgi?id=927702 Bug 927702 - (10.9) Two finger swipe gesture fails, breaks subsequent scrolling (Mavericks)]
Last comment has a suggested work around:
<blockquote>
I then realised I had recently disabled the "Notification Center" swipe on trackpad options (System Preferences -> Trackpad ->More Gestures -> Tick/Untick Notification Center). I re-enabled this and the two finger swipe to go back works as intended.
</blockquote>
Thank you for asking about this. Please feel free to vote on the bug, but before you comment, please see the [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html bugzilla etiquette].

When loading websites with a lot of thumbnails that are linked for example to imageshack Firefox 6 will just freeze and become unresponsive. If i press the reset page buttom sometimes they will load or sometimes firefox will crash, why is this?

If a website has a lot of thumbnails or animated gifs for example firefox will become unresponsive and sometimes either lag and use a lot of system resources i have seen it as high as 1.2GB or it will just lock up and crash.

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes
In Firefox 4 and later [http://kb.mozillazine.org/Safe_mode Safe mode] disables extensions and disables hardware acceleration.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If disabling hardware acceleration works then check if there is an update available for your graphics display driver.

Why Firefox 4 has short freezes and operates sluggish?

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