Unfortunately Typo3 is popular where I work.
At the moment my job is to make a small change in the shop system of an existing site. I noticed that the shop does not work in FF because of JS errors. So I upgrade the shop module. Now the shop category listing does not work anymore, so I have to update other extensions. The small change takes 3 full days, because typo3 is a mess, and finding bugs is impossible because of the overwhelming complexity. Use drupal or rails, anything but typo3 :(