The Fix
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sudo apt-get purge -y firefox firefox-* cd ~ sudo rm -rf .mozilla/firefox/ .macromedia/ /etc/firefox/ /usr/lib/firefox/ /usr/lib/firefox-addons/ sudo apt-get purge -y firefox firefox-* sudo apt-get install -y firefox |
Also don’t delete cookies after the re-installation, if you imported data on the first run from Chrome or Opera.
https://support.mozilla.org/sv/questions/938531