Life hack: Working with production content in your local wiki
I've been meaning to document this for a while.
If you're finding yourself visiting Special:Export/Import often for the
purpose of MediaWiki development there is a much better way to get content
into your local wiki for testing purposes.
This short video explains how MobileFrontend extension provides tooling to
help you debug live on-wiki content via $wgMFContentProviderClass 
Re: Life hack: Working with production content in your local wiki
As an experiment (and be bold etc), I've enabled this for the mobile domain
on the enwiki beta cluster . If you hit any problems with these please
let me know on the ticket  and I or somebody else can revert the
associated config change.
What this means, is live content from production wikis will now appear on
mobile beta cluster pages which do not have a beta cluster version. For
example, https://en.m.wikipedia.beta.wmflabs.org/wiki/Spain shows content
from the beta cluster, but
https://en.m.wikipedia.beta.wmflabs.org/wiki/Singapore shows content from
English Wikipedia. In the case of the latter a 404 response code is sent,
to ensure these pages do not get indexed by search engines. This means that
it shouldn't interfere with any browser tests (Minerva beta cluster tests
are still passing )
This is beneficial for testing out real world content within the context of
a skin e.g. timeless, vector or minerva. We have many frontend bugs that
were difficult to test before this technique. My team has been using this
on labs  for many months now and it's been pretty indefensible to us, so
my thinking is it will be useful to others working with skins.
If it's useful, in future this technique can be used for desktop and other
projects on the beta cluster e.g. wikivoyage BC  - just let me know!
In the unlikely event this breaks any kind of testing you are trying to do,
please point your frustrations at me via the ticket  and I'll roll this
experiment back immediately and you would have given me valuable insights
into ways to improve this tool!