With this addon you can disable the default middle click behaviour on tabs an tabbar.
Important: on install addon disables middle click on tabbar and tabs
Look at the addon preferences for the following options.
- disable/enable opening of the new tab when you click on empty tabbar space
- disable/enable the closing of tab when middle clicking on a tab.
Notice: This addon is still in early stages and therefore hasn't been tested extensively, so please report any issues and I will try to fix it, however full support is not guarenteed.
When submitting an issue please include OS version, Firefox version, installed addons, and any other relevant information (custom about:config settings, steps to find the problem...)