stop FF doing DNS lookup when I hover over a link
I start FF in safe-mode. I open a local page which includes only one URL. When I hover on this link I see (`tcpdump`) a DNS lookup being performed for this domain. I followed the suggestions from Mozilla but I still see this.
How do I stop this access.
I use FF "156.0 (64-bit)" on Fedora 44.
TIA
All Replies (4)
This is described in How to stop Firefox from making automatic connections section "Prefetching" › "Link prefetching" › "DNS prefetching": support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_dns-prefetching
If the preferences documented there do not have any effect, it might be worth reporting either a pref bug, or a stale content at least. Thanks for checking.
Modified by jbr
Yes, what how-stop-firefox-making-automatic-connections recommends was done. Surely I am not the first person to notice this?
I will appreciate hearing from other people doing the same. I simply run
$ sudo tcpdump -l port 53 -i eth1
where eth1 is the interface to my internet modem. Internal connections are on another interface.
I open this file
the conversation
[unfortunately the editor is hiding my actual text. How can I insert unmolested text???]
I then move the focus (the mouse) to another window and hover over the link, briefly, and immediately see
09:09:56.218995 IP e7.eyal.emu.id.au.52426 > h.gtld-servers.net.domain: 47967% [1au] HTTPS? theconversation.com. (60) 09:09:56.219101 IP e7.eyal.emu.id.au.59252 > 120.19.253.254.domain: 11696+ [1au] A? theconversation.com. (48) 09:09:56.219326 IP e7.eyal.emu.id.au.48388 > 120.19.253.254.domain: 3849+ [1au] A? theconversation.com. (48) 09:09:56.396917 IP 120.19.253.254.domain > e7.eyal.emu.id.au.48388: 3849 4/0/1 A 151.101.66.132, A 151.101.130.132, A 151.101.194.132, A 151.101.2.132 (112) 09:09:56.396917 IP 120.19.253.254.domain > e7.eyal.emu.id.au.59252: 11696 4/0/1 A 151.101.66.132, A 151.101.130.132, A 151.101.194.132, A 151.101.2.132 (112)
This is followed by many other probes, but I am only interested in the start of this activity which is timed exactly with the hover. Maybe an add-on is still active, despite the --safe-mode? Some of the probes may be from my local bind, listening to 192.168.3.7. My resolv.conf includes:
nameserver 192.168.3.7 nameserver 120.19.253.253 nameserver 120.19.253.254
Modified by mozilla888
Yes, what how-stop-firefox-making-automatic-connections recommends was done. Surely I am not the first person to notice this?
I will appreciate hearing from other people doing the same. I simply run
$ sudo tcpdump -l port 53 -i eth1
where eth1 is the interface to my internet modem. Internal connections are on another interface.
I open this file
the conversation
[unfortunately the editor is hiding my actual text. How can I insert unmolested text???]
I then move the focus (the mouse) to another window and hover over the link, briefly, and immediately see
09:09:56.218995 IP e7.eyal.emu.id.au.52426 > h.gtld-servers.net.domain: 47967% [1au] HTTPS? theconversation.com. (60) 09:09:56.219101 IP e7.eyal.emu.id.au.59252 > 120.19.253.254.domain: 11696+ [1au] A? theconversation.com. (48) 09:09:56.219326 IP e7.eyal.emu.id.au.48388 > 120.19.253.254.domain: 3849+ [1au] A? theconversation.com. (48) 09:09:56.396917 IP 120.19.253.254.domain > e7.eyal.emu.id.au.48388: 3849 4/0/1 A 151.101.66.132, A 151.101.130.132, A 151.101.194.132, A 151.101.2.132 (112) 09:09:56.396917 IP 120.19.253.254.domain > e7.eyal.emu.id.au.59252: 11696 4/0/1 A 151.101.66.132, A 151.101.130.132, A 151.101.194.132, A 151.101.2.132 (112)
This is followed by many other probes, but I am only interested in the start of this activity which is timed exactly with the hover. Maybe an add-on is still active, despite the --safe-mode? Some of the probes may be from my local bind, listening to 192.168.3.7. My resolv.conf includes:
nameserver 192.168.3.7 nameserver 120.19.253.253 nameserver 120.19.253.254
Modified by mozilla888
Yes, what how-stop-firefox-making-automatic-connections recommends was done. Surely I am not the first person to notice this?
I will appreciate hearing from other people doing the same. I simply run
$ sudo tcpdump -l port 53 -i eth1
where eth1 is the interface to my internet modem. Internal connections are on another interface.
I open this file
the conversation
[unfortunately the editor is hiding my actual text. How can I insert unmolested text???]
I then move the focus (the mouse) to another window and hover over the link, briefly, and immediately see
09:09:56.218995 IP e7.eyal.emu.id.au.52426 > h.gtld-servers.net.domain: 47967% [1au] HTTPS? theconversation.com. (60) 09:09:56.219101 IP e7.eyal.emu.id.au.59252 > 120.19.253.254.domain: 11696+ [1au] A? theconversation.com. (48) 09:09:56.219326 IP e7.eyal.emu.id.au.48388 > 120.19.253.254.domain: 3849+ [1au] A? theconversation.com. (48) 09:09:56.396917 IP 120.19.253.254.domain > e7.eyal.emu.id.au.48388: 3849 4/0/1 A 151.101.66.132, A 151.101.130.132, A 151.101.194.132, A 151.101.2.132 (112) 09:09:56.396917 IP 120.19.253.254.domain > e7.eyal.emu.id.au.59252: 11696 4/0/1 A 151.101.66.132, A 151.101.130.132, A 151.101.194.132, A 151.101.2.132 (112)
This is followed by many other probes, but I am only interested in the start of this activity which is timed exactly with the hover. Maybe an add-on is still active, despite the --safe-mode? Some of the probes may be from my local bind, listening to 192.168.3.7. My resolv.conf includes:
nameserver 192.168.3.7 nameserver 120.19.253.253 nameserver 120.19.253.254
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