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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

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
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
Participate in Desktop Development hyperlink bug Open

Difficulty 1/5 Under an hour Newbie friendliness 85/100

thunderbird/thunderbird-website#1291 · 1 comment · Opened Sep 3, 2026
CNAME records are not correct when adding new domain. Open

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

thunderbird/thunderbird-accounts#1268 · Opened Sep 2, 2026
Send later custom date picker is a bit janky Open

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

thunderbird/stormbox#121 · Opened Sep 2, 2026
[SEND] One press of "new folder" can create two folders (the create mutation retries) Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

thunderbird/tbpro-add-on#1190 · 1 comment · Opened Sep 1, 2026
[Design Committee] Modal updates Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

thunderbird/services-ui#321 · Opened Aug 25, 2026
The CDN answers /config.js with the home page, so the app's runtime settings never load Open

iac infra Send

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

thunderbird/tbpro-add-on#1164 · Opened Aug 24, 2026
Update to MinimumOSVersion 15.0 Open

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

thunderbird/thunderbird-ios#466 · Opened Aug 21, 2026
CORS rejection logs neither the origin nor the route; moz-extension allow-list grows unboundedly Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

thunderbird/tbpro-add-on#1117 · Opened Aug 19, 2026
validate.yaml requests OIDC and a deploy environment it never uses (grants PowerUser on mzla-tb-dev) Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

thunderbird/stalwart-migration-proxy-deploy#21 · Opened Aug 17, 2026
Remove 32-bit Linux option from downloads page Open

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

thunderbird/thunderbird-website#1283 · 5 comments · 1 reaction · Opened Aug 8, 2026
Search results screen is completely blank when a search finds no messages Open

unconfirmed

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

thunderbird/thunderbird-android#11377 · 2 comments · Opened Aug 8, 2026
Show Early Bird plan price as annual and remove subtext Open

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

thunderbird/thunderbird-website#1275 · 2 comments · 1 reaction · Opened Jul 29, 2026
Preserve URL paths when redirecting thundermail.com to tb.pro for marketing pages Open

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

thunderbird/thunderbird-website#1274 · Opened Jul 28, 2026
Better check for SharedWorker support and error path Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

thunderbird/stormbox#91 · Opened Jul 25, 2026
Warn user they are offline upon attempt to refresh Open

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

thunderbird/thunderbird-android#11300 · Opened Jul 24, 2026
Attaching files very quickly can open two upload windows Open

Add-on

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

thunderbird/tbpro-add-on#1028 · Opened Jul 22, 2026
[SEND] Leftover test code puts an invisible clickable element next to the report-confirm link Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

thunderbird/tbpro-add-on#1009 · Opened Jul 20, 2026
Mozilla has updated the policies for mozilla-release (153.0)! Open

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

thunderbird/policy-templates#73 · Opened Jul 19, 2026
Mozilla has updated the policies for mozilla-central (154.0a1)! Open

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

thunderbird/policy-templates#74 · Opened Jul 19, 2026
Fix AppLayout tests to attach the mail store successfully Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

thunderbird/stormbox#83 · Opened Jul 17, 2026
Update Thundermail MFA Code Copy Open

Difficulty 1/5 Under an hour Newbie friendliness 74/100

thunderbird/thunderbird-accounts#1105 · Opened Jul 9, 2026
Low priority: transient Playwright Chromium download timeout in scrape.yml Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

thunderbird/aaq-scraper#24 · Opened Jul 9, 2026
API schema drift detected Open

schema-change

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

thunderbird/aaq-scraper#22 · 1 comment · Opened Jul 8, 2026
Make the Appointment app version visible in frontend Open

enhancement

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

thunderbird/appointment#1735 · 3 comments · Opened Jul 7, 2026
Sign Up page needs emails to be encoded Open

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

thunderbird/thunderbird-accounts#991 · Opened Jun 22, 2026
Donate blurb on landing page is hardcoded Open

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

thunderbird/thunderbird-website#1245 · 1 reaction · Opened Jun 17, 2026
Inconsistent import.meta.env.MODE usages Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

thunderbird/tbpro-add-on#848 · Opened Jun 10, 2026
Mozilla has updated the policies for mozilla-central (153.0a1)! Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

thunderbird/policy-templates#67 · Opened Jun 4, 2026
Mozilla has updated the policies for mozilla-esr140 (140.12.0)! Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

thunderbird/policy-templates#65 · Opened May 30, 2026
Encryption code input field is in plain text Open

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

thunderbird/tbpro-add-on#825 · Opened May 26, 2026
Mozilla has updated the policies for mozilla-release (151.0)! Open

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

thunderbird/policy-templates#61 · Opened May 14, 2026
Mozilla has updated the policies for mozilla-release (150.0)! Open

Difficulty 2/5 1-3 hours Newbie friendliness 65/100

thunderbird/policy-templates#56 · Opened Apr 16, 2026
Mozilla has updated the policies for mozilla-central (151.0a1)! Open

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

thunderbird/policy-templates#57 · Opened Apr 16, 2026
Add Interia specific email addresses Open

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

thunderbird/autoconfig#197 · Opened Apr 2, 2026
Mozilla has updated the policies for mozilla-central (151.0a1)! Open

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

thunderbird/policy-templates#53 · Opened Mar 28, 2026
Mozilla has updated the policies for mozilla-release (149.0)! Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

thunderbird/policy-templates#52 · Opened Mar 26, 2026
Required permission for tabs.executeScript() Open

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

thunderbird/developer-docs#244 · 2 comments · Opened Mar 24, 2026
Remove dots at the end of DNS instructions Open

good first issue

Difficulty 1/5 Under an hour Newbie friendliness 78/100

thunderbird/thunderbird-accounts#578 · 2 comments · Opened Feb 11, 2026
Update requirements for Python 3.14 compatibility Open

Difficulty 1/5 Under an hour Newbie friendliness 76/100

thunderbird/thunderbird-notes#112 · 8 comments · Opened Dec 30, 2025
Update the styling of Send file delivery email to ensure password-protected files have instructions for recipients. Open

Difficulty 2/5 1-3 hours Newbie friendliness 64/100

thunderbird/tbpro-add-on#410 · 5 comments · Opened Dec 13, 2025
Invalid escape sequence warning in builder RewriteRule Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

thunderbird/thunderbird-website#951 · Opened Oct 25, 2025
docs: add description how to work with compose resources Open

type: documentation

Difficulty 1/5 1-3 hours Newbie friendliness 72/100

thunderbird/thunderbird-android#9730 · Opened Sep 5, 2025
Mission Statement on About Us Page. Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

thunderbird/thunderbird-website#784 · 1 reaction · Opened Apr 7, 2025
Add a link to known security vulnerabilities Open

enhancement

Difficulty 1/5 Under an hour Newbie friendliness 62/100

thunderbird/thunderbird-website#589 · 3 comments · Opened May 24, 2024
ja locale update Open

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

thunderbird/import-export-tools-ng#461 · 40 comments · Opened Oct 8, 2023
Android 16+ — Add support for the predictive back gesture Open

tb-team type: enhancement

Difficulty 1/5 Under an hour Newbie friendliness 76/100

thunderbird/thunderbird-android#6476 · 1 comment · 2 reactions · Opened Nov 16, 2022
Fixing a bug: Add parsable CSS test Open

Difficulty 1/5 1-3 hours Newbie friendliness 62/100

thunderbird/developer-docs#125 · Opened Jul 21, 2021

thunderbird

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