Firefox periodically stops loading websites entirely, using 25-30% CPU

Just in the last day or so (possibly around the same time I updated to 7.0.1) I've had difficulty even using Firefox with normal use. After a very short period of time (often less than a minute), Firefox will give up on loading websites. Sometimes a few tabs will load, and then it comes to a complete stop. I can't seem to find a trend, though I've noticed that often a very heavy site like Gmail or ESPN.com will cause this behavior.
While the tabs spin trying to load, my CPU bumps up from the normal 0-10% that Firefox uses when it's working correctly, up to a consistent 25-35%. The only solutions I've found are to restart Firefox (which recreates the problem as when I open again, it attempts to load all the tabs again which repeats the issue) or to manually stop the loading of every page which has not completed, and wait until Firefox calms down back to regular CPU usage. In fact, the usage has been so strong to cause my computer to shut off.
I've tried everything I can think of -- 7.0.1 runs fine on other computers; the internet works fine while Firefox is struggling if I use Chrome alongside it. Loading in Safe Mode hasn't solved the problem either -- the exact same situation occurs.
As some background, up until the last day, I've been a heavy Firefox user, often with multiple Panorama groups with 5-25 tabs per, using TabMixPlus, GreaseMonkey, and Firebug, all known to slow down Firefox, yet I've had no issues beyond (normal) memory bloat, which was always resolved with a restart, and my tabs always reloaded quickly. I've got the processing speed to use Firefox as well, so that's no the issue (QuadCore i7 Processor, 8GB RAM).
It's become frustrating to the point that if this isn't resolved, the browser is borderline-unusable, and I'll have to begrudgingly make a switch to Chrome. Does anyone have ''any'' suggestions?

More information -- I've tried disabling all my Plugins while in Safe Mode, with no success. I've periodically retried Firefox and it always seems like everything's fine, and then it gives up. I've been unable to pinpoint exactly (if anything) could lead to this in general and within a given session.
I've read a number of other tickets and tried other solutions that haven't helped, so I'll mention them or anything else I've learned that could be relevant:
* I've turned off hardware acceleration in Firefox's settings
* I've never used anything besides the default Firefox theme
* My places.sqlite file is quite large (~61MB) and is updated each time I use Firefox, but I don't know if that could be related (another point mentioned it)
* I'm using Windows 7 64-Bit
* I have no configured firewall (and as mentioned, no problems with Firefox ever carry over to another Browser, so it's definitely not internet-related)
* According ProcessExplorer, the thread is stalling on something related to MOZCRT19.dll. Again, don't know if this is helpful or not.
Just waiting on some advice as to what steps I can try next. Thanks!

Similar Messages

Firefox fails to load websites after using Thunderbird

When using my new laptop HP Pavilion dm 1, Windows 7 Home Premium, Firefox 4 fails to load any websites after I have used Thunderbird v3.1.9. The only solution is to reboot which is becoming very annoying. I use Firefox 4 and Thunderbird on 3 HP Desktops using Windows 7 Pro without this problem occurring. I have uninstalled Firefox and Thunderbird and then reinstalled and the problem persists. I even did a complete recovery of the laptop starting fresh as it came from the factory and the problem continues. I have disabled and erased all history. I have tried safe mode. Nothing seems to work. I did note on laptop that default manager 2.2 is not enabled (comes up false in troubleshooting log)...not sure if that's a problem as I am traveling in Dubai and cannot match it against my desktop settings. So long as I do not open Thunderbird I have no problems with Firefox. Could there be some kind of conflict between these programs?

Reload web page(s) and bypass the cache in such cases.
* Press and hold Shift and left-click the Reload button.
* Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
* Press "Cmd + Shift + R" (MAC)

Firefox stops loading websites after a while

Unfortunately I can't narrow down the problem very much. Firefox just stops loading websites after a while without any obvious reasons - while Chrome or IE work, so it's not a connection problem AND I have it on at least 2 PCs. This is my environment:
Windows 7 x64 Ultimate and Pro, all important updates installed. Both PCs have 8-16 GB RAM, SSD - can't be a resource issue.
Actual version of Kaspersky Internet Security is used, Firefox is not blocked.
Firefox version 37.0.1
Some FF AddOns in use: AdBlock Edge, BetterPrivacy, ColorZilla, Firebug, Flashblock, Ghostery, Web Developer
I'm certain I don't have a virus and the issue is present on a brand new installed system as well. I don't use a proxy, DNS prefetching is disabled and IPv6, too.
It seems to happen more often when the PC hasn't been touched for 20 minutes or so (PC is not falling asleep) and after sleep modes, however it also happens just in the middle of working. I usually have 10-20 pages open (resource friendly ones usually) at once.
This also happens for websites that are already loaded. A click on reload also leads to a can't load website error.
I can't exactly say when this issue started, probably in the last 6 month with some FF update. Before it worked fine. This is becoming a real issue for me because FF becoming very unreliable.
Does anyone else experience this behaviour or has a fix for it?
NB: you may want to check the compatibility of your "None of these solve my problem" button. It might be a Chrome (41.0.2272.118m) issue but if someone's FF is not working and he's trying to find help using another browser...it might be a dead end (nothing happens on click).
Example: https://support.mozilla.org/en-US/questions/new/deskto/other?search=can%27t+load+websites+after+while#summarize-question

Does Firefox work normally again after exiting it and starting it backup again?
Several users reported with Firefox 36 that Firefox would eventually not be able to load more pages. One believed that Firefox was no longer sending DNS requests, which is a prerequisite to being able to connect to the web server. I don't recall that we identified the source of the problem, but in many cases, it was "something" in the settings folder.
Along those lines, could you conduct this test:
'''Create a new Firefox profile'''
''This is in addition to and does not replace your existing settings.''
A new profile will have your system-installed plugins (e.g., Flash) and extensions (e.g., security suite toolbars), but no themes, other extensions, or other customizations. It also should come with completely fresh settings databases and a fresh cache folder.
Exit Firefox and start up in the Profile Manager using Start > search box (or Run) -- type or paste the following and press Enter:
firefox.exe -P
''Don't delete anything here.''
Any time you want to switch profiles, exit Firefox and return to this dialog.
Click the Create Profile button, assign a name like April7, and ignore the option to change the folder location. Then start Firefox in the new profile you created.
It might take a while to determine whether the new profile is works better than your old one. If you want to import your bookmarks from your regular profile during that time, here's how:
You can use the Library dialog (Ctrl+Shift+b or "Show All Bookmarks") to access the Restore feature. The trick is knowing where to find your bookmark backups in your regular profile. After clicking Choose File... you can paste this into the file name space and press Enter to drill down to your profile folders:
%APPDATA%\Mozilla\Firefox\Profiles
The semi-randomly-named folder that has your last backup is usually the one ending with "default". Click into that one, then into the '''bookmarkbackups''' folder. Here you can pick the most recently updated file to restore.
Important: restoring a bookmark backup wipes any bookmarks currently in your active Firefox profile and replaces it with the contents of the backup file.
I think it's also reasonable to install AdBlock Plus and Web Developer, as those, by themselves, are unlikely to be the source of this seemingly rare problem. But I wouldn't add all your extensions at once to the new profile.

Firefox will work fine, then for no reason stop loading websites.

I'll be having a great time on Firefox when out of nowhere it will stop loading websites - it won't give me an error message, it will just saying 'connecting' and spin forever. This can happen at any time and is beginning to get really frustrating - sometimes I will go an hour without it happening, sometimes 30 seconds. I'm currently typing this on Internet Explorer, whilst Firefox refuses to open a webpage in the background.
Whenever this happens, I'll have to exit Firefox. This would be fine, although reopening Firefox will then give me a 'Firefox is already running, but not responding' error, followed by the now classic 'Your Firefox profile cannot be loaded, it is missing or inaccessible.' Trying to close it with the Task Manager doesn't seem to work - even when using it with administrative privileges it will not disappear. Right-clicking and selecting 'go to Detail' and trying to close it from there just gives me an 'Access Denied' error. Earlier today, after restarting the computer, Firefox gave me this message before I had even opened it, yet other times it works fire and loads my profile perfectly.
Is there a way to deal with this problem? I've tried creating a new profile, I've tried refreshing Firefox and I've tried Uninstalling and Reinstalling. This happens with or without add-ons installed and is driving me crazy. I have used Firefox for years so have a large selection of bookmarks and passwords that I don't want to lose. Currently running this on a fairly up-to-date laptop with Windows 8 installed.

I was having this same exact problem for the last week. It started happening after Firefox updated. I tried a few different things that didn't help. I tried uninstalling and reinstalling which didn't help either. I finally fixed the problem tonight.
Here are the steps I took to fix it. Make sure you are logged into sync and hit the sync button to update it. This will save your bookmarks and user settings.
If you want to be able to restore your current session go into your main drive and click users, your user name, AppData, Roaming, Mozilla, Firefox, Profiles, open that folder and copy sessionstore-backups and save it to your desktop or somewhere you can remember.
After you have done that uninstall Firefox. Now restart your computer into Safe Mode.
Go into your main drive usually C on most computers and click users, your user name, AppData, Roaming. Click the Mozilla folder and delete it. Now hit the back button and click on Local. Find the Mozilla folder in there and delete it too.
You can now restart your computer and install a fresh copy of Firefox. Once it is installed you can log into sync and it will restore all your settings and bookmarks.
If you want to restore your previous session close Firefox and make your way back to AppData, Roaming, Mozilla, Firefox, Profiles, open the new profiles folder (Example: abcd1234.default) and paste the folder you saved called sessionstore-backups in there.
You can now open Firefox and all your tabs will be there, and after a few mins all your settings and bookmarks will be restored by sync. You shouldn't have any more problems following this method. The pages no longer stop loading and it closes like it is supposed to.

Firefox stops loading websites (even after configuring about:config)

I have FireFox 8 installed, and it always stops loading websites. I've read this thread:
https://support.mozilla.com/en-US/questions/881844
And I followed the chosen solution by "archeocyathan" that is in this thread, and I went to about:config and changed the "max-connections" from 96 to 48.
When I change the "max-connections" - it works fine but only for a few minutes, and then the settings go back again to 96 and I have to change them again.
Questions:
1) Why is that?
2) Is there any way to FORCE about:config to stay with "max-connections" on 48 ? I looked online for ways to save it, but I understand once you make changes they are saved - so why it always changes back from 48 to 96?
3) Any way you can help out with it?
It's FireFox 8 as I mentioned, the latest version of FireFox ... I even uninstalled my Antivirus and nothing worked so far.

The current default of the network.http.max-connections pref in Firefox 8 on Windows should be 48
See:
*http://kb.mozillazine.org/Preferences_not_saved
*https://support.mozilla.com/kb/Preferences+are+not+saved
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration 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

Why does Firefox Mobile stop loading when using VPN?

When I'm connected to Private Internet Access VPN on my phone (using their app in the play store) occasionally Firefox gets into a state in which no webpages can be loaded. I can fix the problem in one of two ways: (1) use Google Chrome for Android or any other app that uses the internet or (2) disconnect from VPN and use Firefox without that protection. Sometimes when I reconnect to VPN, Firefox pages will load again but sometimes not.
The loading bar in Firefox Mobile always gets stuck in the same spot, which I am thinking could be diagnosed to determine which part of the http protocol it might be stuck at. I am hoping I can attach a screenshot.
I really believe in what you guys are doing. Keep fighting the good fight.

It could possibly be that the dns is failing, but to be sure there would need to be a log and need to be tested on lte and wireless to see if its consistent.
This may be what you are experiencing [https://bugzilla.mozilla.org/show_bug.cgi?id=947801 bug 947801 ] Please take note of the bugzilla etiquette: [https://bugzilla.mozilla.org/page.cgi?id=etiquette.html here]

Firefox does not load the entire website, their are many missing parts to many websites

when I am on firefox some of the websites don't finish loading and parts are missing, for example on Wikipedia, when Im on an article the search bar is gone and I cant change the subject, I am able to fix it by refreshing the page but I almost have to do that on every page I visit

* "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
* "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
See also:
* http://kb.mozillazine.org/Websites_look_wrong

Firefox is not loading websites

I attempted to Google search some images, but the page stopped loading even though the tab said it was still loaded. I tried to do a web search instead, but Firefox wouldn't load Google at all. I then decided to restart my computer and run a disk cleanup and cleared my history, but even that didn't stop Firefox from not loading Google. Frustrated, I tried going to other websites, such as Facebook and InsaneJournal, but neither of these would load either. I'm absolutely certain that these websites are all running fine, but my concern is that Firefox's latest update -- not the beta -- is causing my problems.

Firefox > Preferences > Content : Fonts & Colors > Colors > [X] "Allow pages to choose their own colors, instead of my selections above"
See also:
* [[Website colors are wrong]]

Firefox is not loading websites properly on our mac.

Firefox is not loading banners/background images/various interactive buttons etc on '''all''' web sites: I'm using Firefox/3.6.12 on Mac OS 10.4.11
Other browsers are fine: ie Safari and Opera.
Firefox is working fine on our PC.
I have taken screen shots of Google home page and Firefox home page in Ff and Safari to illustrate this point and can email these to you so you can see what's happening. Ff was working fine yesterday.
Entering extra information as requested I've noticed that the Default Plugin is showing as disabled in the Technical info under the Trouble shooting menu but is showing as enabled in the plugins list in the Ff drop down.

Firefox > Preferences > Content : Fonts & Colors > Colors > [X] "Allow pages to choose their own colors, instead of my selections above"
See also:
* [[Website colors are wrong]]

Safari, firefox both stopped loading images suddenly

Everything was working great, then suddenly both safari and firefox stopped loading all images. Ebay, Amazon, Netflix and so on, even the mac store site will not load the images. I am using Safari 6. I have done all the updates, cleared all the caches, did all the suggested things the forums said. Change DNS and so on, nothing is working. I don't understand how this could happen. Can someone please help!!!

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including Wi-Fi on certain iMacs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Firefox 9 cannot load websites but internet explorer 9 can

The title explains it all really. I have read and done all thats in the "Firefox cannot load websites but other programs can" pages regarding firewalls, malware and others.

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls

Safari stops loading website

I have one of the new 27" imacs, with the Apple airport router, Safari 6.05 and OS X 10.8.5. As of the last upgrade , when clicking on websites or if I'm tryiing to open one of my favorite links, safari stops loading the website. The only way to load any website is by me going to the address bar clicking on it and hitting enter, once I do this the site will load, this is not the only problem along with website if I'm watching a video half way through the video it will come to a complete stop and no matter how many times I hit the play button nothing happens. To get the video to run I have to hit the back button leave the webpage and then go forward back to the video click the play where the video will completely load and Im able to finish watching the video. It doesn't matter if its youtube, hulu or any other service I get the same results. Does anyone have any suggestions how to resolve this problem.

Have you installed the supplemental update to 10.8.5?
OS X Mountain Lion 10.8.5 Supplemental Update - Support - Apple

Firefox won't load websites, no error message

Firefox updated to 20.0.1 today. Now it won't load websites. I don't get an error message or the "in process" wheel. I can access websites through internet explorer. I updated internet security but it didn't help.

Check your Windows Firewall preferences and see if it isn't blocking Firefox from showing websites. Also have you checked your internet connection? If your internet connection is working fine yet you can not access any website then it can also have an error. If so I recommend you uninstall and install it again. Sometimes in the process of downloading it can come corrupted, then if possible, download again the newest version of Firefox and install it. But do not forget to check the Firewall.

Firefox can't load websites but my Windows Explorer can. It was working before but now whenever I try to load a page it says "Problem loading page". What can I do to get Firefox to work?

Whenever I try to go on a website, Firefox says "Problem loading page." It won't load any pages. I tried uninstalling and re-installing but it still says and does the same thing.

See https://support.mozilla.com/en-US/kb/Cannot%20connect%20after%20upgrading%20Firefox

How do I stop Firefox from auto-loading websites on startup? Why doesn't it use the cache?

When I open up Firefox, I see a row of "loading circles" swishing around. I don't want my browser to do this, because it slows down my internet connection, it's unnecessary 95% of the time (I often keep tabs open just to have quick access to some text), and sometime it's actually detrimental (for example, when the page has changed since the last time I loaded it, but I actually wanted the information from the former state of the page).
How do I fix it so that Firefox uses the cached page instead of trying to load a new one?
To clarify: I want Firefox to load the new page when I visit a bookmark, or click on a link to a page I've seen before, or press the reload button. I just don't want it to do this when all I've done is start up Firefox.
Let the tabs sit there until I tell them to do something! Can anyone help?
Using:
Firefox 9.0.1
Windows XP SP3

Yes, but at least the start will be faster and only one tab ta the time is checked on the server.
See also:
*http://kb.mozillazine.org/browser.cache.check_doc_frequency

Firefox periodically stops loading websites entirely, using 25-30% CPU

Similar Messages

Maybe you are looking for