To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!

Close

Welcome to Firefox Add-ons.

Choose from thousands of extra features and styles to make Firefox your own.

Close

On the go?

Check out our Mobile Add-ons site.

Close

Toggle Web Developer Toolbar Version History

36 versions

Be careful with old versions!

These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.

Version 4.3 70.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

SeaMonkey 2.20 Support

Download Now

This add-on is not compatible with your version of Firefox because of the following:

    Version 4.2 70.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

    Code Maintenance

    Download Now

    This add-on is not compatible with your version of Firefox because of the following:

      Version 4.1 70.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

      Firefox 22 Support

      Download Now

      This add-on is not compatible with your version of Firefox because of the following:

        Version 4.0 69.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

        Fixing Web Developer Bug

        Download Now

        This add-on is not compatible with your version of Firefox because of the following:

          Version 3.9 69.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

          Toolbar Button Bug Fix

          Download Now

          This add-on is not compatible with your version of Firefox because of the following:

            Version 3.8 69.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

            Toolbar Button Support

            Download Now

            This add-on is not compatible with your version of Firefox because of the following:

              Version 3.7 69.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

              Restartless Support Removal

              Download Now

              This add-on is not compatible with your version of Firefox because of the following:

                Version 3.6 69.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                Localisation Support

                Download Now

                This add-on is not compatible with your version of Firefox because of the following:

                  Version 3.5 68.6 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                  Localisation Support

                  Download Now

                  This add-on is not compatible with your version of Firefox because of the following:

                    Version 3.4 65.5 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                    Minor Bug Fix

                    Download Now

                    This add-on is not compatible with your version of Firefox because of the following:

                      Version 3.3 65.5 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                      Keyboard Short-cut Fix

                      Download Now

                      This add-on is not compatible with your version of Firefox because of the following:

                        Version 3.1 65.5 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                        Seamonkey 2.9 Support

                        Download Now

                        This add-on is not compatible with your version of Firefox because of the following:

                          Version 3.0 65.5 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                          Code Maintenance

                          Download Now

                          This add-on is not compatible with your version of Firefox because of the following:

                            Version 2.35 94.2 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                            Preference Delete Support

                            Download Now

                            This add-on is not compatible with your version of Firefox because of the following:

                              Version 2.2 94.2 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                              Firefox 11 Support

                              Download Now

                              This add-on is not compatible with your version of Firefox because of the following:

                                Version 2.1 94.2 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                                Toolbar Button Support

                                Download Now

                                This add-on is not compatible with your version of Firefox because of the following:

                                  Version 2.0 95.2 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                                  No Restart Support

                                  Download Now

                                  This add-on is not compatible with your version of Firefox because of the following:

                                    Version 1.9 31.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                                    EncodeURI Bug Fix

                                    Download Now

                                    This add-on is not compatible with your version of Firefox because of the following:

                                      Version 1.8 31.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                                      Localisation Support

                                      Download Now

                                      This add-on is not compatible with your version of Firefox because of the following:

                                        Version 1.7 31.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                                        Firefox 9 Support

                                        Download Now

                                        This add-on is not compatible with your version of Firefox because of the following:

                                          Version 1.6 31.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 and later

                                          Seamonkey Support

                                          Download Now

                                          This add-on is not compatible with your version of Firefox because of the following:

                                            Version 1.5 31.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                            Firefox 8 Support

                                            Download Now

                                            This add-on is not compatible with your version of Firefox because of the following:

                                              Version 1.4 31.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                              Firefox 7 Support

                                              Download Now

                                              This add-on is not compatible with your version of Firefox because of the following:

                                                Version 1.3 30.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                                Localisation Update

                                                Download Now

                                                This add-on is not compatible with your version of Firefox because of the following:

                                                  Version 1.2 29.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                                  Swedish and Portuguese (Brazilian) Localisations

                                                  Download Now

                                                  This add-on is not compatible with your version of Firefox because of the following:

                                                    Version 1.1 28.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                                    Firefox 6 Support

                                                    Download Now

                                                    This add-on is not compatible with your version of Firefox because of the following:

                                                      Version 1.0 28.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                                      Firefox 5 Support

                                                      Download Now

                                                      This add-on is not compatible with your version of Firefox because of the following:

                                                        Version 0.9 28.7 KB Works with Firefox 3.0 and later, SeaMonkey 2.0 - 2.0.*

                                                        Seamonkey Support

                                                        Download Now

                                                        This add-on is not compatible with your version of Firefox because of the following:

                                                          Version 0.8 27.6 KB Works with Firefox 3.0 and later

                                                          Localisation Support

                                                          Download Now

                                                          This add-on is not compatible with your version of Firefox because of the following:

                                                            Version 0.7 24.6 KB Works with Firefox 3.0 and later

                                                            Hide Statusbar Icon Preferences Tab

                                                            Download Now

                                                            This add-on is not compatible with your version of Firefox because of the following: