Comment by Tipewryter

To avoid this type of thing I start Chromium via a script that replaces all settings with their defaults when I quit Chromium:

    chromium-browser           \
        --password-store=basic \
        --enable-dom-distiller \
        %U
    rm -r ~/.cache/chromium
    rm -r ~/.config/chromium/Default
    cp -r ~/chromiumDefault \
          ~/.config/chromium/Default

~/chromiumDefault is the dir as it was created when I started Chromium for the first time and set all settings the way I like it. I update it every once in a while when I tweak a setting.