docs(devtools): updating firefox documentation (#44952)

Updating dist path to load Firefox DevTools

PR Close #44952

devtools/docs/firefox.md

@@ -8,7 +8,7 @@ To install Angular DevTools in Firefox follow the steps:-
 
 * Click on `Load Temporary Add-on` button to select and load the Angular DevTools extension for Firefox.
 
-* Select any file from `dist -> shell chrome` directory to load extension. If you have not build extension for Firefox yet. You can do it using `yarn build:firefox` which will generate build for Firefox.
+* Select any file from `dist/bin/devtools/projects/shell-browser/src/prodapp` directory to load extension. If you have not build extension for Firefox yet. You can do it using `yarn build:firefox` which 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.