MacMail, Safari, Firefox work then freeze

I have a 3-4 year old MBP running Os X 10.5.8. about 1-2 weeks ago suddenly encountered similar problem using Mac mail, Safari, and Firefox. When i first open computer and use mail, for example, new messages will download. I cna then send a few replies, but mail will then not get sent on left side says "sending" and lines are going around in a circle, but will not send. I can then quit mail, close computer, re-open computer and re-open mail and message gets sent. But, after a little while, same thing happens with same "fix".
The same thing happens when using safari or firefox: can use for a little while then have to quit, close and re-open.
is there some problem acquiring IP address? some type of firewall that pops up after a few uses of mail, safari, etc? too many users on the wifi (see below)?
over the past 1-2 weeks new additions are two new iphones and a Sprint ethernet antenna (signal booster) for house. of note, my iphone cannot connect with home wifi-same lines going around a circle, whereas my wife's phone is connceted to our home wifi
thanks for your help

It was the ipv6 scanner in Avast antivirus.
I unchecked the "enable IPV6" box in the advanced menu and web browsing came back for all of the sites listed.

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My ipod 5 works, then freezes

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Safari opens, but then freezes

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Embedded movies, Safari/Firefox freezes, then all hangs

Note: This post was moved from 'It's not just Safari, It's Firefox too... Crashing Tiger'
I have the same problem -- although it is linked directly to embedded quicktime movies. Almost every time I go to a page with an embedded movie, Safari / Firefox freezes, taking the rest of the os along with it (finder, other open apps) Unplugging the ethernet doesn't help. Checked the Safari crash log and it doesnt seem to be recording these crashes.

Sounds like lookupd is hanging and taking the OS with it...
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HT204416 My Safari is no longer working with many sites. However Chrome and Firefox work fine. I would like to re-install Safari in an effort to clear up the problem I can not resolve.

My Safari is no longer working with many sites. However Chrome and Firefox work fine. I would like to re-install Safari in an effort to clear up the problem I can not resolve.

1. From the Safari menu bar, select
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Hey, everbody:
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See:
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*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
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*http://kb.mozillazine.org/Profile_folder_-_Firefox
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Windows 7 64 bit: I just upgraded Firefox to 7.1 , I can't watch video on youtube, video freezes, then the browser freezes. I right click on the icon showing the page is open on the taskbar & click close then cancel, it starts then freezes again?

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Hello,
My built-in iSight is no longer working in Safari or Firefox. For example, if I were to go to a website to broadcast my webcam, the flash applet comes up asking to allow/deny the use of camera, I allow, but the camera does not engage (green light does not turn on).
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danleedham wrote:
Is this anything like what I'm getting:
My iSight is working for Photobooth but no other app. Skype, Safari/Firefox, CamCamX etc. All I get is a pure green screen. To confuse you further when I chose what camera to use it either says "Built in iSight" or "Built in iSight Leopard" - Leopard gives me a green screen and no leo gives me the issue "in use with another application".
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for the last 6 months my mac is crashing all the time. I think it is safari because firefox works fine. Any suggestions?

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MacMail, Safari, Firefox work then freeze

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