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Installing Angular DevTools in Firefox 
To install Angular DevTools in Firefox follow the steps:
Open menu item from top bar
Tools -> Browser Tools -> Remote Debugging.After clicking
Remote Debuggingclick onThis Firefoxoption from left navigation. You will see the below screen with list of extensions. Temporary extensions are unreleased extensions loaded in development mode.Click on
Load Temporary Add-onbutton to select and load the Angular DevTools extension for Firefox.Select any file from
dist/bin/devtools/projects/shell-browser/src/prodappdirectory to load extension. If you have not built the extension for Firefox yet, you can do it usingyarn devtools:build:firefoxwhich will generate build for Firefox.After selecting file and clicking open, you should be able to see Angular DevTools as a temporary Extension in Firefox.
Open any Angular application in dev mode and open Firefox DevTools you should see Angular Tab in there.