STR:
Actual result:
Homepage content is only partially loading
Expected result:
AMO homepage is fully loaded
Notes:

Thanks @AlexandraMoga. As we've seen before, and as you've noticed, this is because there is a collection missing on stage. The solution to this is to recreate the collection. The steps to do it are:
I have done this to create the "good-time-tabs" collection, but it looks like at least the "wikipedia-boosters" collection is also missing. Are you able to follow the above steps to create any collections that are missing, or do you need a developer to do that? If the former, this is something that you could do yourself, as part of the verification process, if that's acceptable to you.
Since this isn't a bug but missing content I'm downgrading this from a P1. It's still important as it prevents QA from testing stage though.
Just to reiterate what I said in https://github.com/mozilla/addons-frontend/issues/4552#issuecomment-373010781, this doesn't actually prevent QA from testing stage, as whoever is testing could create the missing collections themselves, by following the instructions I provided.
@bobsilverberg thanks for providing the above steps.
I've added the missing collections - "wikipedia-boosters" and "trending-add-ons" - and stage homepage is now functional.
If we are going to see similar issues in the future, I think QA will be able to fix them without your intervention, as long as these steps are applicable. It will save a lot of time.
That's great, thanks @AlexandraMoga!
Most helpful comment
Thanks @AlexandraMoga. As we've seen before, and as you've noticed, this is because there is a collection missing on stage. The solution to this is to recreate the collection. The steps to do it are:
I have done this to create the "good-time-tabs" collection, but it looks like at least the "wikipedia-boosters" collection is also missing. Are you able to follow the above steps to create any collections that are missing, or do you need a developer to do that? If the former, this is something that you could do yourself, as part of the verification process, if that's acceptable to you.