Why does Firefox on my Windows 7 PC hang (become unresponsive) while it waits for most pages to load or run scripts?
Firefox hangs (becomes unresponsive) when accessing many sites including Gmail. Eventually, when hung, Firefox will throw up a window saying "WARNING: A script has become unresponsive" or, in the case of Gmail, the page itself will say "Some Gmail features have failed to load due to an internet connectivity problem."
IE8 and Google Chrome are working normally. I've tried Firefox in safe mode, re-installing and even running Firefox portable from a USB thumb drive. Each time with the same result—Firefox hangs or becomes unresponsive while it waits for most pages to load or run scripts.
#### PC Workstation Environment ####
Firefox 13.0.1
Windows 7
Symantec Endpoint Protection 11.0.6200.754
--
Your problem sounds like the one that a co-worker and I started to have about the same time. Check your Symantec client management control log. You might see a line like the following.
Date and Time Severity Level Action Test / Production Description API Class Rule Caller Process ID Caller Process Parameter User
2012-07-30 10:48:09 AM 15 Block Production Unauthorized NT call rejected by protection driver. System Built-in rule 1608 FlashplayerPlu FuncID-B6H, R... None
At first we thought that it was a Javascript problem until we noticed this log. The key words are 'Block' and 'FlashPlayerPlu'. This problem recently started for us, perhaps with a software push 1-2 weeks ago. Internet Explorer does not hang when accessing pages with Flash.
The Flash page does eventually load after a long time. However, since the whole browser hangs for a while, for the most part having the Flash plugin enabled makes Firefox unusable if accessing pages with Flash.
Disabling the Flash plugin solves the hanging problem, but I do not know what is causing the problem, nor do I know when a combination of Windows 7, Flash, and Symantec will work. Your later version of Symantec shows that we might have the problem for a while, but I do not know what customization CSC did with Symantec. My coworker did run a complete virus scan, uncovering nothing. Another co-worker is running Windows XP. She does not have the problem, but I do not know what other versions of software she is running.
Symantec Endpoint Protection version 11.0.6100.645
Flash version 11.3.300.268
Firefox version 14.0.1
Windows 7 32-bit service pack 1
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In case you are using "Clear history when Firefox closes":
*do not clear the Cookies
*do not clear the Site Preferences
*Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
*https://support.mozilla.org/kb/Clear+Recent+History
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Clearing cookies will remove all specified (selected) cookies including cookies with an allow exception that you want to keep.
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Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] (don't forget to select ''Disable all add-ons'' when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and themes and [https://support.mozilla.com/en-US/kb/Troubleshooting+plugins this one] for plugins.
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Question
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*http://kb.mozillazine.org/Firefox_hangs
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DetailsStart Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
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See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox -
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''Edited to remove swearing - TonyE''Hi musicfan,<br />Sorry you are having problems with Firefox. Maybe you should have asked earlier and we could have fixed it.
Reading your comments I do not see that rolling back to an insecure Firefox 22 will actually help you much. You are probably best using IE, unless you have also damaged that.
*[[Export bookmarks to Internet Explorer]]
You should not use old versions they are insecure. Security fixes are publicised and exploitable.
* [[Install an older version of Firefox]]
* https://www.mozilla.org/security/known-vulnerabilities/firefox.html
Most others will not be having such problems. We are now able to say that with confidence because after developers missed a regression in Firefox 4 telemetry was introduced so that data was obtained. It may be an idea to turn on your telemetry, if you have not already done so, and decide to stick with Firefox.
*[[Send performance data to Mozilla to help improve Firefox]]
Trying safe mode takes seconds. Unfortunatly if you are not willing to do even rudimentary troubleshooting there is not anything we can do to help you.
*[[Troubleshoot Firefox issues using Safe Mode]]
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