Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

Avatar for Username

Prohledat stránky podpory

Vyhněte se podvodům. Za účelem poskytnutí podpory vás nikdy nežádáme, abyste zavolali nebo poslali SMS na nějaké telefonní číslo nebo abyste sdělili své osobní údaje. Jakékoliv podezřelé chování nám prosím nahlaste pomocí odkazu „Nahlásit zneužití“.

Zjistit více

Toto vlákno bylo archivováno. Pokud potřebujete pomoci, založte prosím nový dotaz.

Firefox 76.0.1 seems to be ignoring the HOSTS file

islanderalmost
islanderalmost
více možností

Windows 10, firefox 76.0.1

All of a sudden Firefox is serving up ads which used to be blocked by my HOSTS file.

Edge and Internet Explorer still seem to be using the HOSTS file OK.

Also, Firefox in a private window seems to use the HOSTS file.

I have deleted cookies and cache - no help.

Attached 3 screenshots, same site, banner Chevy ad with Firefox, hosts file blocks the Chevy ad in a Firefox private window and in Internet Explorer

Windows 10, firefox 76.0.1 All of a sudden Firefox is serving up ads which used to be blocked by my HOSTS file. Edge and Internet Explorer still seem to be using the HOSTS file OK. Also, Firefox in a private window seems to use the HOSTS file. I have deleted cookies and cache - no help. Attached 3 screenshots, same site, banner Chevy ad with Firefox, hosts file blocks the Chevy ad in a Firefox private window and in Internet Explorer
Přiložené obrázky

Zvolené řešení

islanderalmost said
But that begs the question: why does the private window not have the same problem ?

By default, Enhanced Tracking Protection settings are more stringent in private windows than regular windows. See: Enhanced Tracking Protection in Firefox for desktop.

Could that explain it?

Přečíst dotaz v kontextu 👍 2

Všechny odpovědi (4)

TyDraniu
TyDraniu
  • Top 10 Contributor
více možností
  1. I think that the HOSTS file wasn't meant for ad blocking in Firefox. The usual way is to install an addon, for instance ublock origin.
  2. Probably it's because the DNS-over-HTTPS has been turned on. See Firefox DNS over HTTPS.
islanderalmost
islanderalmost Autor dotazu
více možností

Thanks for the info - yes, if I uncheck that box the ads go away.

But that begs the question: why does the private window not have the same problem ?

Also, I tried changing the HOSTS file entries from 0.0.0.0 to 127.0.0.1 - no help.

cor-el
cor-el
  • Moderator
více možností

Some reading:

  • Bug 1453207 - Enabling DNS over HTTPS should respect system hosts file

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
více možností

Zvolené řešení

islanderalmost said
But that begs the question: why does the private window not have the same problem ?

By default, Enhanced Tracking Protection settings are more stringent in private windows than regular windows. See: Enhanced Tracking Protection in Firefox for desktop.

Could that explain it?

Upravil uživatel jscher2000 - Support Volunteer dne