This Could Be Firefox’s New Design

Changes that are made to a web browser that you are using on a daily basis can have a devastating effect. We have seen this happen several times in the past when Mozilla made changes to the design of the Firefox web browser. Especially the move from Firefox 3 to 4 caused an uproar, with part of the userbase still rejecting to update to any version beyond Firefox 3. 

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Story added 6. April 2012, content source with full text you can find at link above.