Rebase our Thunderbird custom package on top of 52.6.0
Feature Branch: feature/15298-thunderbird-52.6.0
Related issues
- Blocks #13245 (closed)
Original created by @anonym on 15298 (Redmine)
Feature Branch: feature/15298-thunderbird-52.6.0
Original created by @anonym on 15298 (Redmine)