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thunderbird

42 indexed repositories · View on GitHub

thunderbird-android
Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)

Kotlin · 14012 stars
thunderbolt
AI You Control: Choose your models. Own your data. Eliminate vendor lock-in.

TypeScript · 4773 stars
thunderbird-ios
Thunderbird for iOS – Open Source Email App for iOS

Swift · 1194 stars
appointment
Invite others to grab times on your calendar. Choose a date. Make appointments as easy as it gets.

Python · 552 stars
import-export-tools-ng
Import Export Tools that supports Thunderbird v140-v143

HTML · 416 stars
thunderbird-website
Build code for the websites on thunderbird.net and start.thunderbird.net

HTML · 298 stars
developer-docs
Developer documentation for Thunderbird contributors.

114 stars
stormbox
A JMAP webmail.

TypeScript · 105 stars
autoconfig
The ISPDB, Thunderbird's database of mail configuration files.

Python · 94 stars
tbpro-add-on
Thunderbird Pro Add-On

TypeScript · 52 stars
thunderbird-notes
Release Notes for Thunderbird

Python · 44 stars
policy-templates
Policy Templates for Thunderbird

JavaScript · 34 stars
webext-support
Additional resources for extension developers (tools, scripts, custom elements, Experiment APIs)

JavaScript · 28 stars
thunderbird-accounts
Thunderbird Accounts

Python · 28 stars
mailstrom
Thundermail Server IaC

Python · 20 stars
pro
Thunderbird Pro Meta Repository

9 stars
services-ui
Shared components for Thunderbird Services Vuejs applications

Vue · 9 stars
thunderbird.net-l10n
gettext files for thunderbird.net and start.thunderbird.net

9 stars
thunderbird-notifications
In-App notifications for Thunderbird

Python · 7 stars
pulumi
Common Pulumi elements for use in Thunderbird infrastructure development

Python · 4 stars
22 more repositories live on View on GitHub

Beginner friendly Everything

Open All

Create a method to clear appointment / send users oidc_id Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

thunderbird/thunderbird-accounts#1330 · Opened Sep 18, 2026
Wire INTERNAL_API_KEYS into the Send backend deployments (stage/prod Pulumi config) Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

thunderbird/tbpro-add-on#1261 · Opened Sep 18, 2026
Donation Appeal — Add Funding Reminder to FOSS Builds Open

tb-team

thunderbird/thunderbird-android#11580 · 1 comment · 1 assignee · Opened Sep 18, 2026
Consolidate desktop and mobile contact.spec E2E test Open

thunderbird/thunderbird-accounts#1328 · 1 assignee · Opened Sep 18, 2026
Add Sun/Moon icons Open

thunderbird/services-ui#331 · 1 assignee · Opened Sep 18, 2026
K-9 Android app does not show email is signed Open

unconfirmed

Difficulty 4/5 3-5 days Newbie friendliness 52/100

thunderbird/thunderbird-android#11576 · 3 comments · Opened Sep 17, 2026
Send: sanitize URLs sent to PostHog (redact share-link ids, reduce capture surface) Open

security Send

Difficulty 4/5 3-5 days Newbie friendliness 74/100

thunderbird/tbpro-add-on#1254 · Opened Sep 17, 2026
Verify the Accounts→Send storage integration on stage Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

thunderbird/tbpro-add-on#1250 · Opened Sep 17, 2026
Cache storage endpoint responses (deferred until Redis is ready) Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

thunderbird/tbpro-add-on#1251 · Opened Sep 17, 2026
Add an internal rate-limit tier for service callers Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/tbpro-add-on#1249 · Opened Sep 17, 2026
Add the internal per-user storage endpoint to the Send backend Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/tbpro-add-on#1248 · Opened Sep 17, 2026
Add service-to-service auth middleware to the Send backend Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

thunderbird/tbpro-add-on#1247 · Opened Sep 17, 2026
Error generating ADMX for tb 140 Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

thunderbird/policy-templates#75 · Opened Sep 17, 2026
Donation Appeal — Migrate K9 Preferences to Config Store Open

tb-team

thunderbird/thunderbird-android#11575 · 1 comment · 1 assignee · Opened Sep 17, 2026
Account shortcuts no longer work since latest update Open

unconfirmed

Difficulty 3/5 1-2 days Newbie friendliness 58/100

thunderbird/thunderbird-android#11572 · 1 comment · Opened Sep 17, 2026
Design tweaks for new NavBar Open

thunderbird/appointment#1840 · 1 assignee · Opened Sep 16, 2026
Delete the unused legacy Send add-on build Open

ci/cd Send

Difficulty 4/5 3-5 days Newbie friendliness 65/100

thunderbird/tbpro-add-on#1243 · 1 comment · Opened Sep 16, 2026
[BUG] Pii-Safe Compiler Plugin — FIR checker not considering Type Arguments annotated with `@PiiSafe.HasPii` Open

good first issue

thunderbird/thunderbird-android#11570 · 2 comments · 1 assignee · Opened Sep 16, 2026
Rotating the phone makes drafts disappear!? Open

unconfirmed

Difficulty 3/5 1-2 days Newbie friendliness 48/100

thunderbird/thunderbird-android#11568 · 1 comment · Opened Sep 16, 2026
Proposal: add shared test factories to reduce fixture boilerplate Open

thunderbird/thunderbird-accounts#1319 · 3 assignees · Opened Sep 16, 2026
JPG attachments have..txt extension added Open

unconfirmed

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/thunderbird-android#11566 · 2 comments · Opened Sep 15, 2026
v15 issue with table in message body Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

thunderbird/import-export-tools-ng#962 · 7 comments · Opened Sep 15, 2026
Repeat entry of phone pin to reveal imap/smtp password on Android 16 but not 10 Open

status: help wanted

Difficulty 3/5 1-2 days Newbie friendliness 55/100

thunderbird/thunderbird-android#11565 · 2 comments · Opened Sep 15, 2026
Update `/mail` redirects to be `/dashboard` instead Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

thunderbird/thunderbird-accounts#1313 · 1 comment · Opened Sep 15, 2026
Remove non-system add-on artifacts from CI Open

ci/cd

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/tbpro-add-on#1238 · Opened Sep 15, 2026
Make site-level message adjustable Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

thunderbird/thunderbird-accounts#1310 · Opened Sep 15, 2026
Add new E2E navbar test Open

thunderbird/appointment#1836 · 1 assignee · Opened Sep 15, 2026
Refactor Donation Appeals for Campaigns Open

tb-team

thunderbird/thunderbird-android#11557 · 1 comment · 1 assignee · Opened Sep 14, 2026
24.0b2 - HTML signature text disappears after rotating screen Open

tb-team

thunderbird/thunderbird-android#11555 · 3 comments · 1 assignee · Opened Sep 14, 2026
Donation Appeal — Create Test Branch Open

tb-team

thunderbird/thunderbird-android#11554 · 1 comment · 1 assignee · Opened Sep 14, 2026
[SEND] Add E2E test to verify reset for multiple clients Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/tbpro-add-on#1233 · 2 comments · Opened Sep 14, 2026
Export to EML (v15) with a right-click in the email Open

Difficulty 3/5 1-2 days Newbie friendliness 72/100

thunderbird/import-export-tools-ng#961 · 1 comment · Opened Sep 14, 2026
Component to display relative dates Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 70/100

thunderbird/services-ui#326 · 2 comments · Opened Sep 13, 2026
Feature request: combined multi-format export (EML + PDF + HTML) in one action, each in its own subfolder Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

thunderbird/import-export-tools-ng#960 · Opened Sep 13, 2026
Component to handle truncating long names Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/services-ui#325 · Opened Sep 13, 2026
Crash on "Add to Contacts" when no contacts app is available Open

tb-team

thunderbird/thunderbird-android#11548 · 1 comment · 1 assignee · Opened Sep 12, 2026
Donation Appeal — New Donation Display Logic Open

tb-team

thunderbird/thunderbird-android#11547 · 1 comment · 1 assignee · Opened Sep 11, 2026
Update /dashboard references to be /calendar Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

thunderbird/appointment#1831 · Opened Sep 11, 2026
a11y: Add aria-hidden="true" to decorative icons Open

good first issue

Difficulty 3/5 1-2 days Newbie friendliness 58/100

thunderbird/thunderbird-accounts#1304 · 2 comments · Opened Sep 11, 2026
Block folder creation while keychain is locked (lock-era folders can be unrecoverable after recovery) Open

Send

Difficulty 3/5 1-2 days Newbie friendliness 68/100

thunderbird/tbpro-add-on#1229 · Opened Sep 11, 2026
Appointment stage dashboard Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 55/100

thunderbird/platform-grafana#43 · Opened Sep 11, 2026
Upgrade minSDK from 23 to 24 Open

tb-team

Difficulty 5/5 Over a week Newbie friendliness 20/100

thunderbird/thunderbird-android#11545 · Opened Sep 11, 2026
Show a clear message when uploads are rate-limited (429) instead of a generic failure Open

Send

Difficulty 3/5 1-2 days Newbie friendliness 78/100

thunderbird/tbpro-add-on#1224 · Opened Sep 11, 2026
Downgrade logging for expected Account.DoesNotExist case in custom-domains/remove Open

thunderbird/thunderbird-accounts#1302 · 1 assignee · Opened Sep 11, 2026
Reach out to Mailfence to delist our sending IPs Open

thunderbird/mailstrom#255 · 1 assignee · Opened Sep 11, 2026
`deleteMessages` holds a write transaction for 39 s, blocking the controller queue and all DB readers Open

type: performance

Difficulty 4/5 3-5 days Newbie friendliness 48/100

thunderbird/thunderbird-android#11542 · 3 comments · Opened Sep 11, 2026
Scrape the remaining 654 public en-US KB articles for KB-wide markup search Open

thunderbird/sumo-linter#8 · 1 assignee · Opened Sep 10, 2026
AccData: Integrate live email data into Thunderbird app Open

thunderbird/thunderbird-ios#500 · 1 comment · 1 assignee · Opened Sep 10, 2026
AccData: Integrate live mailboxes data into Thunderbird app Open

thunderbird/thunderbird-ios#499 · 1 comment · 1 assignee · Opened Sep 10, 2026
Publish to npm registry Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

thunderbird/webext-linter#4 · 3 comments · Opened Sep 10, 2026

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