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The "Forget about this site" feature in the History pane is intended to remove all saved user data that indicates a user has visited a site. This includes removing any HTTP Strict Transport Security (HSTS) settings received from sites that use it. Due to a bug, sites on the pre-load list also have their HSTS setting removed. On the next visit to that site if the user specifies an http: URL rather than secure https: they will not be protected by the pre-loaded HSTS setting. After that visit the site's HSTS setting will be restored. This vulnerability affects Firefox < 69 and Firefox ESR < 68.1.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade firefox-esr | Nov 8, 2019 | Sep 27, 2019 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Sep 27, 2019 |
| Centos_linux | — | Upgrade firefoxUpgrade firefox-debugsourceUpgrade firefox-debuginfo | Sep 5, 2019 | Sep 4, 2019 |
| Debian | — | Upgrade firefox-esr | Jul 30, 2024 | Sep 27, 2019 |
| Freebsd | — | Upgrade waterfoxUpgrade linux-seamonkeyUpgrade firefox-esrUpgrade thunderbirdUpgrade firefoxUpgrade seamonkeyUpgrade linux-firefoxUpgrade libxulUpgrade linux-thunderbird | Sep 4, 2019 | Sep 3, 2019 |
| Mfsa2019 25 | — | Upgrade to Mozilla Firefox version 69.0Upgrade to the latest version of Mozilla Firefox | Sep 4, 2019 | Sep 3, 2019 |
| Mfsa2019 26 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 68.1 | Sep 4, 2019 | Sep 3, 2019 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade mail/thunderbird to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade web/browser/firefox to version 78.3.0-11.4.27.0.1.82.0 on Solaris 11.4Upgrade mail/thunderbird/plugin/thunderbird-lightning to version 68.12.0-11.4.27.0.1.82.0 on Solaris 11.4 | Jan 19, 2021 | Sep 27, 2019 |
| Oracle_linux | — | Upgrade firefox | Jul 21, 2020 | Sep 3, 2019 |
| Redhat_linux | — | No solution existsUpgrade firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox | Sep 5, 2019 | Sep 4, 2019 |
| Suse | — | Upgrade firefox-gtk3-branding-upstreamUpgrade mozilla-nsprUpgrade firefox-gtk3-immodule-inuktitutUpgrade firefox-libffi4Upgrade MozillaFirefox-translations-commonUpgrade firefox-gdk-pixbuf-query-loadersUpgrade firefox-gtk3-dataUpgrade firefox-gtk3-immodules-tigrignaUpgrade MozillaFirefoxUpgrade firefox-gtk3-immodule-multipressUpgrade firefox-glib2-langUpgrade MozillaFirefox-develUpgrade libfirefox-gmodule-2_0-0Upgrade libfirefox-gthread-2_0-0Upgrade firefox-libharfbuzz0Upgrade mozilla-nspr-32bitUpgrade firefox-gtk3-immodule-thaiUpgrade firefox-gtk3-immodule-vietnameseUpgrade libsoftokn3-32bitUpgrade mozilla-nss-toolsUpgrade mozilla-nspr-develUpgrade mozillafirefox-branding-sleUpgrade firefox-gio-branding-upstreamUpgrade libfirefox-gobject-2_0-0Upgrade firefox-libcairo-gobject2Upgrade mozilla-nss-certs-32bitUpgrade mozilla-nss-develUpgrade mozillafirefox-buildsymbolsUpgrade firefox-gtk3-toolsUpgrade firefox-glib2-toolsUpgrade firefox-libffi7Upgrade firefox-libgtk-3-0Upgrade firefox-libcairo2Upgrade libfreebl3-32bitUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-branding-SLEDUpgrade firefox-libpango-1_0-0Upgrade firefox-libgdk_pixbuf-2_0-0Upgrade libsoftokn3Upgrade firefox-gtk3-immodule-ximUpgrade mozillafirefox-branding-upstreamUpgrade firefox-gtk3-immodule-amharicUpgrade mozilla-nssUpgrade mozilla-nss-32bitUpgrade firefox-gdk-pixbuf-thumbnailerUpgrade firefox-atk-langUpgrade libfreebl3Upgrade libfirefox-gio-2_0-0Upgrade libfirefox-glib-2_0-0Upgrade firefox-gdk-pixbuf-langUpgrade firefox-libatk-1_0-0Upgrade mozilla-nss-certsUpgrade firefox-gtk3-lang | Oct 8, 2019 | Sep 3, 2019 |
| Ubuntu | — | Upgrade firefox | Sep 5, 2019 | Sep 3, 2019 |
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