Integration test for browser and front-end

We need a good sanity check for when we deploy our new versions. We should have a integration test that covers the relationship between the add-on and our client. For instance, we deployed a version where the tool broke in production. We should ensure that this never happens by having some kind of coverage to ensure the tool is not broken.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-145)