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ThunderBrowse Thunderbird extension adds a URL bar to the Thunderbird interface, thus allowing you to be able to view Web sites without having to open browsers. ThunderBrowse is a unobtrusive because it doesn't require you to add any more buttons to your toolbar, as it adds to the message preview pane, without taking up much space.
What's new in this version:
Version 3.81 adds compatibility with Postbox 3.0, fixes context menu bugs, and improves View Source code.