You can download browser add-on source code from this page. If you are an end-user, see the download page instead.
Terms and conditions
If you are interested in participating in the development process, you are welcome to email us patches for improvements and bug fixes.
Source code is available on the Firefox page, the IE page, the Chrome page, the Safari page and the Opera page. You can also extract the source code by unzipping the .xpi file available from Mozilla or the .crx file available from Google.