Package: firefox Version: 61.0-1 Severity: normal Installing Firefox language packs (e.g firefox-l10n-ru) didn't have an effect. I looked at Add-ons > Language packs and saw the following warning:
Russian (RU) Language Pack could not be verified for use in Firefox. Proceed with caution. Disabling signature verification somewhere at about:config did solve the issue. --- System information. --- Architecture: Kernel: Linux 4.16.0-2-amd64 Debian Release: buster/sid 990 testing ftp.by.debian.org 500 unstable ftp.by.debian.org --- Package information. --- Depends (Version) | Installed ===============================================-+-=================== libatk1.0-0 (>= 1.12.4) | 2.28.1-1 libc6 (>= 2.27) | libcairo-gobject2 (>= 1.10.0) | libcairo2 (>= 1.10.0) | libdbus-1-3 (>= 1.9.14) | libdbus-glib-1-2 (>= 0.78) | libevent-2.1-6 (>= 2.1.8-stable) | libffi6 (>= 3.0.4) | libfontconfig1 (>= 2.12.6) | libfreetype6 (>= 2.2.1) | libgcc1 (>= 1:4.2) | libgdk-pixbuf2.0-0 (>= 2.22.0) | libglib2.0-0 (>= 2.31.8) | libgtk-3-0 (>= 3.0.0) | libhunspell-1.6-0 | libjsoncpp1 (>= 1.7.4) | libnspr4 (>= 2:4.10.9) | libnss3 (>= 2:3.34~) | libpango-1.0-0 (>= 1.14.0) | libsqlite3-0 (>= 3.14.0) | libstartup-notification0 (>= 0.8) | libstdc++6 (>= 6) | libvpx5 (>= 1.6.0) | libx11-6 | libx11-xcb1 | libxcb-shm0 | libxcb1 | libxcomposite1 (>= 1:0.3-1) | libxdamage1 (>= 1:1.1) | libxext6 | libxfixes3 | libxrender1 | libxt6 | zlib1g (>= 1:1.2.11.dfsg) | fontconfig | procps | debianutils (>= 1.16) | Package's Recommends field is empty. Suggests (Version) | Installed ===============================-+-=========== fonts-stix | 1.1.1-4 OR otf-stix | fonts-lmodern | 2.004.5-3 libgssapi-krb5-2 | OR libkrb53 | libcanberra0 | libgtk2.0-0 | --- Output from package bug script --- -- Addons package information -- --------------------- Alexander Kernozhitsky