Let tests on thuderbird beta fail
Let tests on thuderbird beta fail

Thunderbird beta is now version 67 and will be going through a lot
of changes that affect addons.

I'll work with the beta version in a branch but want to know if the
stable releaes gets broken via the weekly build, to know when users
are affected.

beltrachi/automatic_dictionary,beltrachi/automatic_dictionary,beltrachi/automatic_dictionary,beltrachi/automatic_dictionary