CardBook breaks on newer Thunderbird, ESR, beta and forks
CardBook is disabled or broken on newer Thunderbird releases, ESR, beta and forks like Betterbird.
Tier II · Emerging Problems that are still building up.
4 public reports · first reported 21 April 2019 · last reported 3 October 2026
What's going wrong
CardBook, the contacts add-on for Mozilla Thunderbird, is being switched off or left misbehaving on newer Thunderbird builds.
AI-assisted: written with the help of AI from the reports. The idea report has the full summary.
In the idea report
- The full summary.
- The products the 4 reports are about, and how many came each month.
- Related problems.
No business has been found with this problem yet, so the report has no contacts. All sales are final — no refunds. Pricing.