Congratulations! You have made both Firefox and Thunderbird unusable. With the latest Firefox screwed up update I can no longer get my bookmarks to show in a column on the left side of my screen. With Thunderbird I can no longer get my addressed to show when I try to send an email. Will you please unfuck your upgrades. I will now have to use another supplier. Guess I won't be sending any money to support mozilla.
This should help in Firefox:
This should help with Thunderbird: