Web Developer 0.4 for Chrome is now available. The extension can be downloaded on the Google Chrome extension gallery.
The release notes contain the full list of changes in this version, but some highlights are:
Under the hood this is also essentially a complete rewrite of the extension that merges the code base with the Firefox version. This should allow improved features, fewer bugs and more frequent releases going forward.
The Web Developer extension has always needed access to your browsing history as that is how it is able to add custom scripts to any web site for its features to work. However, some of the new features now require extra permissions such as access to cookies. As explained in the FAQ none of this data is accessed beyond the needs of the features of the extension and no personal data is sent from the extension to a third-party apart from for the third-party features such as validators.