If you're using Firefox on your Mac and having issues with slow web browsing, it may be due to the fact that Firefox is attempting to do IPV6 DNS lookups. The main symptom for this problem is that every time you attempt to browse to a new page, the status in the bottom left corner says "
Locating whatever website..." and it takes a few seconds before the page starts to load. However, once you get to the page, browsing speeds up.
The problem is that Firefox attempts to resolve IPV6 addresses first then attempts to resolve IPV4 addresses by default. If your ISP's DNS server does not support IPV6, this will cause a delay. Fortunately, the good people at Mozilla gave us a way to change this setting.
To fix this, you can disable IPV6 in Firefox by following the steps below:
- Open Firefox, type about:config in the address bar and hit enter.
- You'll receive a warning, click the button that says "I'll be careful, I promise!"
- Find the preference named network.dns.disableIPV6 and double click it to set it to true.
- Restart Firefox
Now your browsing should speed up because Firefox will now only attempt to resolve addresses in IPV6 format. For more information about this issue check out
http://kb.mozillazine.org/Network.dns.disableIPv6.
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