The Vue developer tools are available for Chrome and Firefox and can be downloaded from GitHub (https://github.com/vuejs/vue-devtools). Once installed, they become an extension of the browser developer tools. For example, in Chrome, they appear after the Audits tab.
The Vue developer tools will only work when you are using Vue in development mode. By default, the unminified version of Vue has the development mode enabled. However, if you are using the production version of the code, the development tools can be enabled by setting the devtools variable to true in your code:
Vue.config.devtools = true
Throughout the book, we've been using the development version of Vue, so the dev tools should work with all three of the SPAs we have developed. Open the Dropbox example and open the Vue developer tools.