Mozilla IAM Site Checker
This is an in-development add-on that puts a small green checkmark in the address bar for sites on which it is safe to use your Mozilla credentials on. On other sites there is a hidden page action in the menu that shows a red X and a note that it is not safe to use your Mozilla IAM credentials on this site.
The list of sites is hard coded into the add-on. The current list is:
yarn install --frozen-lockfile yarn build
A built add-on will be placed in