If your Vue.js devtools were working previously and are no longer responding, there could be several reasons for this. Here are some common troubleshooting steps you can take:

1. Check Vue.js Version: Make sure you are using a compatible version of Vue.js with the Vue Devtools. The Vue Devtools usually supports Vue 2.x, but using an older version like 2.1.6 might cause issues. Try updating to a more recent stable version, like 2.6.x.

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.js"></script>

2. Check Console for Errors: Open the browser’s developer console (usually F12 or right-click > Inspect) and check for any JavaScript errors that might indicate what is going wrong.

3. Ensure Devtools is Opened Before Page Load: Sometimes, if the Devtools are opened after the page has loaded, it may not capture the Vue instance. Try opening the Devtools before refreshing the page.

4. Disable Other Extensions: Other browser extensions may interfere with the functionality of Vue Devtools. Try disabling other extensions to see if that resolves the issue.

5. Reinstall Vue Devtools: Since you mentioned that it says it’s already added, you can try removing and then reinstalling the Vue Devtools extension.

6. Clear Browser Cache: Sometimes cached files can cause issues. Clear your browser’s cache and try reloading the page.

7. Check for Vue Devtools in the Console: In the console, you can check if Vue is properly detected:

Vue.config.devtools // Should return true

8. Local Development: If you’re working on a local environment or using frameworks that have their own build systems (like Vue CLI, Nuxt.js), ensure that the devtools are configured to work with them.

9. Use Production Build: Make sure you are not using the production build of Vue, as the devtools will not work with it. If you see `vue.js` instead of `vue.min.js`, you’re using the development build, which is correct.

10. Allow access to files: go to chrome://extensions/, scroll down to the Vue.js devtools and enable the “Allow Access to file URLs” by clicking on its checkbox.

11. Try installing beta version for vue devtools if you are using vue 3.

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