This KiCad action plugin searchs for tracks or vias with selected width.
Just copy the whole KiFind folder into the KiCad plugins directory, then restart KiCad. The KiFind plugin should now be available in the Tools/External plugin menu. KiFind icon will also be shown in the tools bar of your pcbnew editor.
Just start the plugin and select whatever you want to find (tracks or vias). After the execution all tracks or vias with choosen parameters will be selected.
Plugin code is licensed under BSD 3-Clause license, see LICENSE for more info.