Cardiff in making iron and later steel, brought to the sea by packhorse from Merthyr Tydfil. This was first achieved by the construction of a long canal from Merthyr (510 feet above sea-level) to the Taff Estuary at Cardiff. Eventually the Taff Vale Railway replaced the canal barges and massive marshalling yards sprang up as new docks were developed in Cardiff – all prompted by the soaring worldwide demand for coal from the South Wales valleys. At its peak, Cardiff's port area, known as Tiger Bay, became the busiest port in the world and – for some time – the world's
Mozilla software rebranded by Debian e-mail client. In February 2017, Thunderbird packages were reintroduced into the Debian repositories, and on April 20, 2017, the Icedove package in Debian Stable was de-branded back to Thunderbird. Iceowl was a calendar application distributed by the Debian project. It was based on Mozilla Sunbird, but was made entirely of free software. The Lightning calendar extension for Mozilla Thunderbird was rebranded as iceowl-extension. Mozilla Foundation owns the trademark "Firefox" and claims the right to deny the use of the name and other trademarks to unofficial builds. The Debian Free Software Guidelines are used by the Debian project to determine whether