Vimperator was the first project from Vimperator labs and initially written by Martin Stubenschrott. Being a Vim-lover, he finally realized that he spent more and more time browsing the Web instead of writing code in his favorite editor. The remedy this situation, he looked into extending his favorite browser Firefox and Vimperator was born.
In 2008, Vimperator's ideas really took off and lots of new contributors started improving Vimperator. Martin also decided to investigate a possible port of Vimperator to other Mozilla applications, like Thunderbird. Especially Doug Kearns and Kris Maglione helped in designing a library - called liberator - which provides a framework to create Vim-like applications. Muttator and Xulmus followed soon and currently a vivid community with many hackers is working on the projects.
In 2010, a huge redesign started to from the basis of what would become Vimperator 3.0 and later versions. Due to some controversy between the main developers, Vimperator split into the main 3.0 branch which incorporates the new streamlined design guidlines and Pentadactyl which focuses on feature-ladden Vim compatibility.
In 2011, the vimperator labs developers decided to focus again on Vimperator and Muttator and dropped Xulmus (the "Vimperator for Music") from the repository as there was no active maintainer and because of the general quality of the port.
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