* Thimble code editor/learning tool [https://thimble.mozilla.org Thimble code editor/learning tool] (node.js, HTML5) [https://github.com/mozilla/thimble.mozilla.org/issues?q=is%3Aissue+is%3Aopen+label%3A%22Good+First+Bug%22 "Good First Bug"]* Addons Server [https://github.com/mozilla/activity-stream Firefox Activity Stream] (JS, CSS) [https://github.com/mozilla/activity-stream#for-developers dev docs] [https://github.com/mozilla/activity-stream/issues?q=is%3Aopen+is%3Aissue+label%3A%22Good+first+bug%22 "Good first bug"]* [https://addons.mozilla.org/ Addons Server] (Python/Django Server and API) [https://github.com/mozilla/addons-server/labels/contrib%3A%20good%20first%20bug "good first bug"]* A-Frame WebVR framework [https://aframe.io/ A-Frame WebVR framework] [https://github.com/aframevr/aframe/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted+%28easy%29%22 "help wanted, easy"]* [https://developer.mozilla.org/en-US/docs/Tools Firefox Dev Tools ] (JavaScript, CSS, React, etc) [http://bugs.firefox-dev.tools/?easy&tool=all "easy" bugs].* [http://firefox-dev.tools/debugger.html/ Firefox JavaScript Debugger] (React, JS) [https://t.co/4ewG5n9Q8D bugs], [https://t.co/LHCPAxhgVS more bugs].* [https://network.mozilla.org/ Mozilla Network site ] (Python web app) [https://github.com/mozilla/network/labels/help%20wanted "help wanted"]* [https://www.mozillapulse.org/featured Network Pulse API ] (Python REST API server) [https://github.com/mozilla/network-pulse-api/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22 "help wanted"]* Pontoon [https://pontoon.mozilla.org/ Pontoon localization tool] (Python, JS, HTML5) [https://bugzilla.mozilla.org/buglist.cgi?product=Webtools&component=Pontoon&resolution=---&list_id=10786825 unedited bug list]* Testpilot experimental feature tool [https://testpilot.firefox.com/ Testpilot] experimental feature tool (React, HTML5, JS) [https://github.com/mozilla/testpilot/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+bug%22 "good first bug"]* [https://mozilla.github.io/pdf.js/ PDF.js ] (JavaScript PDF viewer used in Firefox) [https://github.com/mozilla/pdf.js/labels/5-good-beginner-bug "good-beginner-bug"]* [https://itunes.apple.com/ca/app/firefox-web-browser/id989804926?mt=8 Firefox Mobile iOS ] ([https://github.com/mozilla-mobile/firefox-ios Objective-C, Swift, iOS]) [https://www.joshmatthews.net/bugsahoy/?mobileios=1&simple=1 "good first bugs"]* [https://play.google.com/store/apps/details?id=org.mozilla.firefox&hl=en Firefox Mobile Android ] (Java, C++, JS) [https://www.joshmatthews.net/bugsahoy/?mobileandroid=1&simple=1 "good first bugs"]* [http://mozilla-balrog.readthedocs.io/en/latest/ Balrog ] Update Service (Python) https://github.com/mozilla/balrog - some potential bugs: [https://bugzilla.mozilla.org/show_bug.cgi?id=1396859 1396859], [https://bugzilla.mozilla.org/show_bug.cgi?id=1138418 1138418], [https://bugzilla.mozilla.org/show_bug.cgi?id=1374638 1374638], [https://bugzilla.mozilla.org/show_bug.cgi?id=1386400 1386400]* [https://www.neon-bindings.com/ Neon] (Rust bindings for node.js) see [http://calculist.org/blog/2017/09/25/neon-wants-your-help/ recent post about ways to get involved]

* [https://www.rust-lang.org Rust ] (programming language, sites, and project) [https://www.rust-lang.org/en-US/contribute.html contribute docs], [https://github.com/rust-lang/rust/labels/E-easy "easy" bugs], [https://github.com/rust-lang/crates.io/issues?q=is%3Aissue+is%3Aopen+label%3AE-easy Crates.io package manager "easy" bugs], [https://www.rustaceans.org/findwork other ideas for contributing to Rust and tooling]* [http://rr-project.org/ rr ] (C++ debugging tool for Linux) [https://github.com/mozilla/rr/labels/goodfirstbug "goodfirstbug"], good [http://cppcast.com/2015/12/robert-ocallahan/ podcast about what rr is here].

|Dan Epstein|https://bugzilla.mozilla.org/show_bug.cgi?id=1402394|http://www.danepstein.ca/firefox-developer-tools-bugzillamozilla-bug-1402394/

| Hadi Saeed|https://bugzilla.mozilla.org/show_bug.cgi?id=1377840|http://techbreaksblog.wordpress.com/2017/10/10/contributing-to-mozilla-pontoon/

| Jiel Selmani|https://github.com/devtools-html/debugger.html/pull/4230https://bugzilla.mozilla.org/show_bug.cgi?id=1402387|http://mylyfeincode.blogspot.ca/2017/10/landed-two-prs-and-made-new-friend-part_11.html

| Nicholas Krause|https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80188||https://nicholas95com.wordpress.com/2017/10/15/first-bug-and-interactions-with-gcc-community/

| Michael Pierre|https://github.com/mozilla/thimble.mozilla.org/pull/2514 https://github.com/mozilla/thimble.mozilla.org/pull/2522|https://michaelpierreblog.wordpress.com/2017/10/15/first-bug-release-mozilla-thimble/

| Svitlana Galianova|https://github.com/devtools-html/debugger.html/pull/4463|http://svitlanagalianova.blogspot.ca/2017/10/small-step-for-developer-giant-leap-for.html

| Avedis Zeitounilian|https://bugzilla.mozilla.org/show_bug.cgi?id=1407392https://github.com/mozilla/balrog/pull/426#pullrequestreview-70242112|http://avedis777.blogspot.ca/2017/10/my-first-bug-fix-completed.html

| Azusa Shimazaki|https://github.com/mozilla/thimble.mozilla.org/issues/2118|http://assmith2017.blogspot.ca/2017/10/first-bug-fixing.html

| Joao Rodrigues|https://github.com/mozilla/thimble.mozilla.org/pull/2528|https://jmrodriguesgoncalves.blogspot.ca/2017/10/assignment-1-fixing-real-bug.html

| Sean Prashad|https://github.com/rust-lang/rust/pull/44960 https://github.com/neon-bindings/neon/pull/257 https://github.com/rust-lang/crates.io/pull/1098|http://seanprashad.com/blog/round-one.html

| Ajla Mehic|https://github.com/mozilla/brackets/pull/886|https://amehic.wordpress.com/2017/10/20/first-bug-fixed/

| Joshua Longhi|https://bugzilla.mozilla.org/show_bug.cgi?id=1405246 https://bugzilla.mozilla.org/show_bug.cgi?id=1408428|https://jlonghiblog.wordpress.com/2017/10/20/fixing-mozilla/

| Anthony LoMagno|https://github.com/mozilla/brackets/pull/885|https://anthonylomagno.wordpress.com/2017/11/29/the-first-release-and-the-importance-of-communication/

| Marco Beltempo|https://github.com/mozilla/thimble.mozilla.org/issues/1918https://github.com/mozilla/thimble.mozilla.org/issues/2518|https://www.marcobeltempo.com/open-source/contributing-thimble-mozilla/

| Leonel Jara|https://bugzilla.mozilla.org/show_bug.cgi?id=1403502#c16|https://lejara.wordpress.com/2017/10/29/my-first-bug-adventure-finished/

| Earle white|https://bugzilla.mozilla.org/show_bug.cgi?id=1406320|https://ewhite7blog.wordpress.com/2017/11/01/mozilla-first-bug/

| Mithilan Sivanesan|https://bugzilla.mozilla.org/show_bug.cgi?id=1403956|https://mithilanblog.wordpress.com/2017/10/25/enabling-eslint-my-first-bug/

| Jay Yin|https://github.com/mozilla/foundation.mozilla.org/issues/798|http://jyopensource.blogspot.ca/2017/10/working-on-my-first-open-source.html

| Marvin Sanchez|https://github.com/mozilla/testpilot/pull/2975https://github.com/mozilla/testpilot/pull/2932|https://marvinrsanchez.wordpress.com/finding-your-first-good-bug-in-the-community/

| Teddy Prempeh| https://github.com/teddypee/thimble.mozilla.org/pull/1| https://teddyprempeh.wordpress.com/2017/11/24/my-first-bug-fix/

| Mat Babol|https://bugzilla.mozilla.org/show_bug.cgi?id=1403883https://github.com/mozilla/activity-stream/issues/3639|http://mmbabol.blogspot.ca/2017/11/first-bugs-completed.html

| Diana Dinis-Alves|https://github.com/mozilla/brackets/pull/887https://github.com/devtools-html/debugger.html/pull/4523|https://ddinisalves.wordpress.com/2017/11/27/first-pull-requests/

| Steven De Filippis|https://github.com/mozilla/pdf.js/pull/9197|https://dps909.defilippis.ca/index.php/2017/11/28/satisfying-apples-safaris-undefined-methods-pdf-js-issue-8726/

| Hans van den Pol|https://github.com/mozilla/brackets/pull/898|https://opensourcetoronto.wordpress.com/2017/11/28/my-first-bug-has-been-solved/

| Gaurav Verma|https://github.com/mozilla/brackets/pull/897|https://gblogs2017.wordpress.com/2017/11/29/update-on-my-first-bug/

| Parthkumar Patel|https://github.com/mozilla/brackets/pull/900|https://ppatel221.wordpress.com/2017/11/29/the-finish-line/

| Eric Schvartzman|https://github.com/mozilla/brackets/pull/879|https://ericschvartzman.blogspot.ca/2017/12/open-source-release-01.html

| Fateh Sandhu|https://github.com/mozilla/thimble.mozilla.org/pull/2535https://github.com/mozilla-bteam/bmo/pull/328|https://firefoxmacblog.wordpress.com/2017/11/29/first-release/

| Eric Suarez|https://github.com/mozilla/thimble.mozilla.org/pull/2571|https://esoscode.wordpress.com/2017/12/07/my-first-fix/

| Igor Naperkovskiy|https://github.com/naperkovskiy|https://naperkovskiyblog.wordpress.com/2017/12/31/assignment-1/

| Arpit Gandhi|https://github.com/devtools-html/debugger.html/pull/4905|https://arpit1667.wordpress.com/2018/01/04/my-first-bug/