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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 firefox-debuginfoUpgrade firefox-debugsourceUpgrade firefox | Sep 5, 2019 | Sep 4, 2019 |
| Debian | — | Upgrade firefox-esr | Jul 30, 2024 | Sep 27, 2019 |
| Freebsd | — | Upgrade libxulUpgrade linux-thunderbirdUpgrade waterfoxUpgrade firefoxUpgrade seamonkeyUpgrade thunderbirdUpgrade firefox-esrUpgrade linux-firefoxUpgrade linux-seamonkey | 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/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 11.4Upgrade 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 11.4 | Jan 19, 2021 | Sep 27, 2019 |
| Oracle_linux | — | Upgrade firefox | Jul 21, 2020 | Sep 3, 2019 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade firefox-debuginfoNo solution existsUpgrade firefox | Sep 5, 2019 | Sep 4, 2019 |
| Suse | — | Upgrade MozillaFirefox-develUpgrade firefox-libharfbuzz0Upgrade libfirefox-gthread-2_0-0Upgrade firefox-gtk3-immodule-multipressUpgrade mozillafirefox-branding-sleUpgrade firefox-gio-branding-upstreamUpgrade firefox-gtk3-immodule-vietnameseUpgrade mozilla-nspr-develUpgrade firefox-glib2-langUpgrade firefox-gtk3-immodule-thaiUpgrade MozillaFirefoxUpgrade libsoftokn3-32bitUpgrade firefox-gtk3-dataUpgrade firefox-gtk3-branding-upstreamUpgrade firefox-gdk-pixbuf-query-loadersUpgrade MozillaFirefox-translations-commonUpgrade mozilla-nsprUpgrade firefox-gtk3-immodule-inuktitutUpgrade libfirefox-gobject-2_0-0Upgrade mozilla-nss-toolsUpgrade firefox-libffi4Upgrade mozilla-nspr-32bitUpgrade firefox-gtk3-immodules-tigrignaUpgrade libfirefox-gmodule-2_0-0Upgrade firefox-gtk3-immodule-ximUpgrade firefox-libgtk-3-0Upgrade libsoftokn3Upgrade mozilla-nss-develUpgrade firefox-gdk-pixbuf-thumbnailerUpgrade firefox-gtk3-toolsUpgrade firefox-atk-langUpgrade libfirefox-gio-2_0-0Upgrade libfreebl3Upgrade firefox-gtk3-immodule-amharicUpgrade mozilla-nssUpgrade MozillaFirefox-branding-SLEDUpgrade firefox-libgdk_pixbuf-2_0-0Upgrade firefox-libpango-1_0-0Upgrade firefox-libffi7Upgrade firefox-libcairo2Upgrade firefox-glib2-toolsUpgrade mozillafirefox-buildsymbolsUpgrade libfreebl3-32bitUpgrade MozillaFirefox-translations-otherUpgrade firefox-libcairo-gobject2Upgrade firefox-libatk-1_0-0Upgrade firefox-gdk-pixbuf-langUpgrade mozilla-nss-certsUpgrade firefox-gtk3-langUpgrade libfirefox-glib-2_0-0Upgrade mozilla-nss-32bitUpgrade mozilla-nss-certs-32bitUpgrade mozillafirefox-branding-upstream | Oct 8, 2019 | Sep 3, 2019 |
| Ubuntu | — | Upgrade firefox | Sep 5, 2019 | Sep 3, 2019 |
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