[test/fix] prevent FirefoxHelper from silently failing to start
This was breaking some tests without any obvious error message and you should
fail as early as possible to make debugging easier.
Closes #17260390
Tutorials
~~~~~~~~~
We present a few tutorials of different levels. The blog building
tutorial introduces one smoothly to the basic concepts.
Then there is a photo gallery construction tutorial which highlights
more advanced concepts such as unit tests, security settings,
migration scripts.
.. toctree::
:maxdepth: 1
base/index
advanced/index
tools/windmill.rst
textreports/index
dataimport/index