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Disabling DNS Prefetch in Thunderbird and Firefox
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Mozilla Necko based apps (like newer Firefox and Thunderbird) have a little feature that resolves DNS entries for
URLs it sees to help speed up things when you click them. This can be used as a web bug, or more important to this
page, it can be used to confirm you read the message.
To disable prefetching in Thunderbird and Thunderbird based clients:
Find the user.js file for Thunderbird
(it will be in your Thunderbird profile directory. create one if none exists)
Paste this in:
user_pref("network.dns.disablePrefetch", true);
You may also consider the following, even though not required for the DNS prefetch, nor some even supposed to apply
to mail, I like to make sure:
user_pref("network.dns.disablePrefetchFromHTTPS", true);
(disable from https is supposed to be the default setting anyway, but lets
just make sure)
user_pref("network.prefetch-next",false);
user_pref("network.dns.disableIPv6", true);
Save file and exit. You can restart Thunderbird.
To disable prefetching in Firefox:
Exit Firefox if running.
Find the file user.js and edit
it (it will be in your Firefox profile directory. Create if it does not exist)
Paste this in:
user_pref("network.dns.disablePrefetch", true);
You may also consider the following, even though not required for the DNS prefetch, they are good from a privacy
and preventatitve perspective:
user_pref("network.dns.disablePrefetchFromHTTPS", true);
(disable from https is supposed to be the default setting anyway, but lets
just make sure)
user_pref("network.prefetch-next",false);
user_pref("network.dns.disableIPv6", true);
Save file and exit, you can restart Firefox.
Notes: you may also use the about:config
editor with the browser or options-general-config_editor for Thunderbird, in addition, future updates or changes
could alter these values. |
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