Firefox lags when I switch tabs

Whenever I switch tabs, it takes 2-10 seconds for firefox to respond. When it takes longer, windows even mark browser as Not responding.
In the task manager I can see that it is using full one of my 4 cores.
Very rarely, the firefox also "spits out" the tab I click into a new window - what is that supposed to be?
I tryed to click tabs, double click tabs and none of such actions led to a new window - but as soon as the browser lags, new window is very likely to appear.
I have added the debug info. But I insist that the thing is same in the no-addon mode. I also remember having similar problem with clean firefox installation.

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

Similar Messages

Firefox freezes when I switch tabs or write in a form.

Every time I switch tab by clicking on them(and sometimes when using the short cut, ctrl+tab ctrl+2 etc) or when I start writing in the awesomebar/a form Firefox freezes. It just visual freeze so I can still go to a website, click on stuff and so on. But when I resize the window by pressing F11 or something like that it returns to normal. I've tried to disable all the plugins and add-ons and i've tried to make a clean reinstall, and when I say clean, I mean clean (deleted all the mozilla/firefox folders in /AppData etc) . Two things that's not affected by this freezes is
1. Flash objects
2. The title of the page. (the tabs title still freezes)
I'm using a ProBook 4330s and I have tons of friends using the exact same model with firefox who's not experiencing this problem. Also note that I don't have this problem with Chrome or Explorer.

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

Why does firefox autostart when I switch computer on

why does firefox autostart when I switch computer on

[[Firefox launches automatically when your computer starts]]
If you have nothing Firefox related in your startup folder,
Your issue may be caused by Malware. You can run and update the following '''free''' anti virus software:
1. Malwarebytes (Free version) - http://www.malwarebytes.org
2. Spybot Search & Destroy - http://www.safer-networking.org
3.Spyware Terminator - http://www.spywareterminator.com
In addition, there are a number of forums you can use to help get rid of your infection. These include:
*[http://www.bleepingcomputer.com/forums/ Bleeping Computer]
*[http://forums.spybot.info/ Safer-Networking Forums]
*[http://www.spywarewarrior.com/index.php Spyware Warrior Forums]
*[http://www.spywarewarrior.com/index.php SpywareInfo Forums]

Why do YouTube videos lag when I switch to 720p?

Hi guys,
I'm extremely annoyed by the fact that everytime I watch a YouTube video and switch the quality from a standard 480p to a 720p or 1080p HD, the video gets lagged out. After restarting my Macbook Pro, it gets better and in a short while when I try to view it in 720p again, it gets laggy again. I have no problems viewing it in 320p or 480p. I notice this happens after I installed a number of updates on my Mac OS X 10.
Here's a list of updates I made.
(1) iTunes 10.4
(2) Mac OS X Update 10.6.8
(3) iMovie 9.0.4
(4) Remote Desktop Client Update 3.5.1
(5) Digital Camera Raw Compatibility Update 3.7
(6) Java for Mac OS X 10.6 Update 5 1.0
(7) AirPort Utility 5.5.3
(8) Migration Assistant Update for Mac OS X 1.0
(9) Safari 5.1
(10) iDVD 7.1.2
(11) ProApps QuickTime codecs 1.0
Does anybody have any idea which of these updates that has caused my Macbook Pro to react unusually? Everything seems pretty normal except this YouTube video.
Thanks.

A lot of people on the other forums seem to suggest it's the internet connection.
I can tell you for one that I have never experienced anything like this before. In the past two years with the same internet plan, I have been able to watch 720p and 1080p HD YouTube videos without any problem. Just today after installing those updates, the video gets lagged whenever I switched to 720p HD.
I just restarted my Macbook Pro and everything is fine for now. In half an hour or so, it's gonna happen again.

Firefox crashes when using multiply tabs

When using multiply tabs Firefox crashes I get the not responding message and something to do with a script error etc. Is there anything I can do

can you check this issue on Firefox 9?
* getfirefox.com

Firefox crashes when opening new tab

Crash-ID: bp-681f1751-fc5b-4f14-a30b-f93ed2150407
I have tryed:
Clean install (with removing of C:prog..\mozilla)
Uninstalling and deleting extensions
Restarted Firefox in safe mode without addons/extensions.
Uninstalling/updating flash/adobe
I can start firefox, but when i press the "+" to open a new tab Firefox closes and "Mozilla Crash-report" window opens.
It seems like firefox it self can open a tab. For example when i do a fresh installation, Firefox opens with 2 tabs.
But when i want to open one it fails and Firefox shuts down. Its really wierd because i have never run in to this kind of problem before and i dont recall installing anything new before this problem showed up.

''avfallskvarn [[#question-1056211|said]]''
<blockquote>
Crash-ID: bp-681f1751-fc5b-4f14-a30b-f93ed2150407
I have tryed:
Clean install (with removing of C:prog..\mozilla)
Uninstalling and deleting extensions
Restarted Firefox in safe mode without addons/extensions.
Uninstalling/updating flash/adobe
I can start firefox, but when i press the "+" to open a new tab Firefox closes and "Mozilla Crash-report" window opens.
It seems like firefox it self can open a tab. For example when i do a fresh installation, Firefox opens with 2 tabs.
But when i want to open one it fails and Firefox shuts down. Its really wierd because i have never run in to this kind of problem before and i dont recall installing anything new before this problem showed up.
</blockquote>
''cor-el [[#answer-714817|said]]''
<blockquote>
What is the setting of the new tab page?
You can check the browser.newtab.url pref on the about:config page.
You can open the about:config page via the location/address bar.
You can accept the warning and click "I'll be careful" to continue.
*http://kb.mozillazine.org/about:config
See this article about the New Tab page (about:newtab):
*https://support.mozilla.org/kb/new-tab-page-show-hide-and-customize-top-sites
</blockquote>
Thx! For some reason the string was set to "about:newtab" or something like that. Changed the name to my default homepage and the problem was fixed. Any ideas on why this happend? I didn't change it myself.
Never the less! Thank you for saving my haircolour from turning gray of frustration. Was worried i had to turn to Chrome or.... IE....

Safari refreshes when I switch tabs, erasing active form content.

Ever since upgrading to iOS 8, Safari refreshes often when I switch between tabs, resulting in anything I have entered into active browser forms getting erased. This wasn't an issue prior to iOS 8. Anyone have a solution for this?

Anyone know if any of the current beta versions of iOS have this fixed? Remember how wonderful things were with iOS 6? Safari felt a lot more stable then. I really hope this gets patched soon.

Firefox closes when opening mulitiple tabs even in the safe mode

Opening mulitle tabs from NY Times or Washington Post website.
Firefox will close.
Upon reopening, I activate "Restore Session" and all of the tabs load.
I have disabled JavaScript.
It has done this in the "safe" mode.

Thanks for the note about profile locations.
I deleted mimeType.rdf in my existing profile, still have the same issue - can't view Tools -> Options for the Applications tab, or download a file. Same goes for a new profile - the same issues arise.
Firefox never does crash, I can leave it in this hung state for hours (I left it in a 'not responding' state last night and it was still hung this morning).
I was going to add a screen shot to this post but Firefox hung when I clicked on the 'Browse' button. Perhaps this is an issue when FF tries to interact with my directory structure? Does that get us any leads on what's wrong?
FYI, I currently have my antivirus disabled & not running in the task bar just in case that was interfering somehow.

My NoSquint zoom settings are all screwed up. They magnify and de-magnify when I switch tabs. How do I fix this?

NoSquint was working fine. Then, after an unexpected power outage, it stopped working fine after I powered my computer back up. Basically, the problem is this: I open a new tab, and the page loads to its desired magnification. I open another tab, and that page loads to its desired magnification. Then I switch back to the first tab, and the page is no longer at the desired magnification. Then I switch back to the second tab, and that page is no longer at the desired magnification. So I'm constantly re-setting the magnification, each time I switch tabs.
Before the outage I had noticed that this was a problem with Facebook pages (for whatever reason), but it never happened with other pages. Now it happens for all the pages I load.
Also since the power outage, I've noticed that pages are loading funny--text overlapping other text, images off register, etc.
Please help restore my once near-perfect browser to near perfection!

You can try:
* http://kb.mozillazine.org/Preferences_not_saved
You can rename the file content-prefs.sqlite to content-prefs.sqlite.old (or delete the file) in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Profile Folder] to reset the page zoom on all sites.

Firefox lags when it is running more than 16 hours

I usually do not turn off my pc for weeks. In browser I am running about 20-30 tabs at the same time and I do not want to close it till I decide it is not needed anymore. But in firefox I forced to restart it every 10-12 hours as soon as it starts lagging. No other programs on my pc las. The load of my processor is about 30-40 percent and I have more than 30% of my ram free, so it is not the ardware issues. For example, chrome, at the same time has no lags at all with this kinn of usage. I really like firefox more than chrome and would like to use it, so I would be very grateful for your help!
P.S: There are only 2 addons for ff installed. They are: ABP and FireBug.

Firebug is notorious for causing problems like you described.
Disable it when you don't need it or install it in a 2nd Profile. Then you can launch the 2nd Profile separately to use Firebug and not affect what you are doing in the 1st Profile,

Firefox lags when scrolling

Hi! I've just installed Firefox Beta on my HTC Desire HD and I have a problem. Even though everything seems to work quickly, scrolling lags a lot, even on very simple mobile websites. It's strange, because at the moment when it's not lagging, scrolling is very smooth - it's just that when scrolling, every few moments it just stops or jumps instead of scrolling smoothly. I don't think it's a problem with my phone, because other browsers that I've tried (the built in browser, and Opera Mobile) don't have that problem. Is it a known bug? Does anyone else have it? Can it be fixed somehow?

Hello TAJNOST, any luck if you [https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems#w_turn-off-hardware-acceleration Turn off hardware acceleration] ?
thank you

Firefox crashes when closing a tab

Well, the title says it all.
I don't know if it is coming from the addons or Firefox itself. If you have two tabs and if you close one of the tabs. It freezes and it will say not responding. Eventually, it will close the tab.

Actually, never mind. I got this fixed. Apparently, MSN Toolbar is the issue. I uninstalled it from my computer and it is working fine. Thanks, anyway.

Temporarily show tab bar upon switching tabs with the keyboard in fullscreen mode

I use Firefox in fullscreen mode and switch tabs with Ctrl + PgUp/PgDn. I need to peek at the tab bar when I switch tabs, to avoid searching for the desired tab with multiple shortcut presses.
Is there a way to temporarily show the tab bar when I switch tabs with the keyboard shortcut? I want the tab bar to hide again after, say, 2 seconds of no tab switching.

You can try to set the focus to the location bar with Ctrl+L before switching the tabs to make the toolbar and tab bar appear.

Firefox 33.0 lags in text typing/ selecting/ deleting & switching tabs

After an automatic update from FF 32.0.3 to FF 33.0 on 17 Oct 2014, there had been a severe browser lag. Each user action or input results in a lag lasting 1–5 secs each, making the browser very difficult & unpleasant to use.
<ul>
<li>Typing Text: 1–2 secs before each letter appears</li>
<li>Highlighting Text (self-typed & web-rendered text): 2–3 secs before desired text is highlighted, & only partially (eg. For "impossible", can only highlight "imposs" or "ssible")</li>
<li>Deleting Text: 1–2 secs before each letter gets deleted</li>
<li>Switching Between Tabs: 2–5 secs for switch</li>
<li>Webpage Scrolling: 1–2 secs for each turn (for mouse wheel) or down-swipe (for touchpad)</li>
</ul>
All of the above issues occur everytime despite system restart, having only 1–2 tabs open, & even when FF is the only application running. I have not encountered the aforementioned problems in FF 32.0.3 & earlier FF versions, or in other browsers.
Other than FF being automatically updated to FF 33.0 on 17 Oct 2014, there was no other change (ie. no application install/ uninstall, no Windows update) that day or the preceding few days.
The lag disappears if FF 33.0 is run in safe mode with all add-ons disabled. But testing with add-ons disabled one by one does not isolate which add-on (if any) might be involved.
<ul>
<li>Laptop: Lenovo IdeaPad Y460</li>
<li>OS: Windows 7 SP 1</li>
<li>Display Adapters: ATI Mobility Radeon HD5650 (driver: 8.702.5.0 latest version), Intel HD Graphics (driver: 8.702.5.0 latest version)</li>
<li>Firefox User Experience: FF 33.0 (very bad lag), FF 32.0.3 & earlier (all function ok)</li>
<li>Browser Add-ons & Plugins: All latest versions</li>
</ul>
What I eventually did (a few days before reporting here after registering a user account):
Since I was unable to resolve the problem, I performed a successful system restore, but the rolled-back browser (FF 32.0.3) was unable to launch (error code: "can't load XPCOM"). Subsequently, I resorted to installing a fresh copy of FF 32.0.3.
<hr>
Since 17/18 Oct 2014, I have encountered a couple of reports about similar lag issues in FF 33.0 (& possibly since FF 32.0.* for some users). The collective symptoms & feedback suggest that it is probably not add-ons causing the issue, but some newly-created incompatibility or conflict with certain (or combinations of) display/ graphics adapter(s). So far, the reported affected adapters that I have come across include the ATI Mobility Radeon HD5000 series, Intel HD Graphics, & NVIDIA GeForce.
The temporary workaround appears to be disabling the hardware acceleration option. But since this is not a long-term solution, I am holding off updating to FF 33.0 (again) or to the just-released FF 33.0.1, until this issue is officially recognized & resolved.
Note:- Some users with text/ tab lagging problems also reported slowness wrt video &/or flash pages, which I can't verify because I had not tested FF 33.0 on video/ flash pages before reinstalling FF 32.0.3. (The text, tab & scrolling lags are enough to keep me away from browsing anything but the most basic webpages.)
Some Feedback References (for affected users & FF developers):
<ul>
<li>Firefox UI is slow when typing or selecting text (after 33.0 update) (Mozilla Support Forum, posts: 17 Oct–20 Oct 2014): https://support.mozilla.org/en-US/questions/1026328</li>
<li>Bug 1087794: Firefox 33.0 exhibits weird behavior like slow typing, flash content blinking, problems with text selection (Bugzilla@Mozilla, posts: 22 Oct–23 Oct2014): https://bugzilla.mozilla.org/show_bug.cgi?id=1087794</li>
<li>Crippling lag since version 32 (Reddit, posts: 8 Oct–25 Oct 2014): https://www.reddit.com/r/firefox/comments/2iobft/crippling_lag_since_version_32</li>
<li>Firefox v33.0: Closing tabs or switching between tabs sometimes hangs for 30-40 seconds (Reddit, posts: 23 Oct 2014): https://www.reddit.com/r/firefox/comments/2k40zx/closing_tabs_or_switching_between_tabs_sometimes</li>
</ul>
Possibly related to the same bug:-
<ul>
<li>YouTube slowing after update (Reddit, posts: 16 Oct–18 Oct 2014): https://www.reddit.com/r/firefox/comments/2jfkap/youtube_slowing_after_update</li>
<li>Browser Lag (mostly when opening a tab or scrolling on webpage) (Reddit, posts: 15 Oct–16 Oct 2014): https://www.reddit.com/r/firefox/comments/2jcxns/browser_lag</li>
</ul>

Hello,
Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.
'''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link}
While you are in safe mode;
Type '''about:preferences'''<Enter> in the address bar
Select '''Advanced > General.'''
Look for and turn off '''Use Hardware Acceleration'''.
Poke around safe web sites. Are there any problems?
Then restart.

In Firefox 5, when I open a new tab, Firefox doesn't switch to it immediately (unlike previous versions). How can I restore this setting?

When opening a new tab Firefox stays on the old tab and doesn't switch to the new one. I couldn't fing where to fix this (in the tools)

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Firefox lags when I switch tabs

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