Key resources
Firefox is Mozilla's popular Web browser, available for multiple platforms including Windows, macOS, and Linux on the desktop and all Android and iOS mobile devices. With broad compatibility, the latest in Web technologies, and powerful development tools, Firefox is a great choice for both Web developers and end users.
Mozilla provides Firefox 3 for Windows, Linux, and Mac OS X in a variety of languages. You can get the latest version of Firefox 3 here. For builds for other systems and languages not provided by Mozilla.org, see the Contributed Builds section at the end of this document. 在您的所有裝置而不只是瀏覽器也能獲得保護。 產品承諾. 了解各 Firefox 產品如何尊重您，保護您的資料。 Firefox Relay. 不用交出電子郵件地址就能註冊新帳號。 Firefox Private Network (beta) 保護您瀏覽器與網際網路之間的連線。 檢視所有產品. 在您的所有裝置而不只是瀏覽器也能獲得保護。 產品承諾. 了解各 Firefox 產品如何尊重您，保護您的資料。 Firefox Relay. 不用交出電子郵件地址就能註冊新帳號。 Firefox Private Network (beta) 保護您瀏覽器與網際網路之間的連線。 檢視所有產品. During this period high-risk patches should avoid landing until after the Nightly version bump lands on mozilla-central on merge day. Past branch dates More details on contents of releases can be found in the release notes archive or Wikipedia: Firefox version history. Firefox 正體中文版下載：將所有超棒之處結合在一起，讓您的瀏覽變得更好。 （火狐瀏覽器 Mac/Windows/Linux 版）.
Firefox is an open source project; much of the code is contributed by our huge community of volunteers. Here you can learn about how to contribute to the Firefox project and you will also find links to information about the construction of Firefox add-ons, using the developer tools in Firefox, and other topics.
Learn how to create add-ons for Firefox, how to develop and build Firefox itself, and how the internals of Firefox and its subprojects work.
- Developer release notes
- Developer-focused release notes; learn what new capabilities for both Web sites and add-ons arrive in each version of Firefox.
- Project documentation
- Get detailed information about the internals of Firefox and its build system, so you can find your way around in the code.
- Developer guide
- Our developer guide provides details on how to get and compile the Firefox source code, how to find your way around, and how to contribute to the project.
Firefox channels
Firefox Nightly
Each night we build Firefox from the latest code in mozilla-central. These builds are for Firefox developers or those who want to try out the very latest cutting edge features while they're still under active development.
Firefox Developer Edition
This is a version of Firefox tailored for developers. Osx install android sdk. Firefox Developer Edition has all the latest developer tools that have reached beta. We also add some extra features for developers that are only available in this channel. It uses its own path and profile, so that you can run it alongside Release or Beta Firefox.
Learn more about Firefox Developer Edition.
Firefox Beta
Every four weeks, we take the features that are stable enough, and create a new version of Firefox Beta. Firefox Beta builds are for Firefox enthusiasts to test what's destined to become the next released Firefox version.
Firefox
Macx youtube downloader for mac catalina. After stabilizing for another four weeks in Beta, we're ready to ship the new features to hundreds of millions of users in a new release version of Firefox.
Firefox Extended Support Release (ESR)
Firefox ESR is the long-term support edition of Firefox for desktop for use by organizations including schools, universities, businesses and others who need extended support for mass deployments.
Learn more about Firefox Extended Support Release.
Contents
- Experimental features in Firefox
- In order to test new features, Mozilla publishes a test version of the Firefox browser, Firefox Nightly, every day. These nightly builds of Firefox typically include experimental or partially-implemented features, including those for proposed or cutting-edge Web platform standards.
- Firefox developer release notes
- Below you'll find links to the developer release notes for every Firefox release. These lovingly-crafted notes provide details on what features and APIs were added and improved and what bugs were eliminated in each version of Firefox. All written to give developers like you the information they need most. You're welcome.
- Privacy
- This document lists privacy-related documentation.
Firefox profiles
If you find yourself using multiple Firefox channels—or just multiple configurations—on a regular basis, you should read how to use multiple Firefox profiles by turning Firefox's Profile Manager and other profile management tools to your advantage.
See also
About Mozilla Firefox Browser
Clean my mac apple store. This schedule is based on the current RapidRelease plan. Future dates may change if the process changes. Code is not always released to users on the same day as the branch migration. The release to users may be a few days later, to allow for manual testing and sign-off. Thunderbird tracks the ESR schedule column per Thunderbird release info.
Calendars
This wiki page may not always have the most current information. Please refer to one of the following calendars for up-to-date scheduling:
- Firefox Merge/Release Dates (ICS for Thunderbird/Lightning or your calendar app) (low noise)
- Firefox Merge/Release Full Scheduling Calendar (ICS) (highly detailed - 99.99% up to date)
Future branch dates
| Quarter | Soft Freeze | Merge Date | Nightly | Beta | Release Date | Release | ESR |
|---|---|---|---|---|---|---|---|
| Q2 2021 | 2021-05-27 | 2021-05-31 | Firefox 91 | Firefox 90 | 2021-06-01 | Firefox 89 | Firefox 78.11 |
| 2021-06-24 | 2021-06-28 | Firefox 92 | Firefox 91 | 2021-06-29 | Firefox 90 | Firefox 78.12 | |
| Q3 2021 | 2021-07-22 | 2021-07-26 | Firefox 93 | Firefox 92 | 2021-07-27 | Firefox 91 | Firefox 78.13; 91.0 |
| 2021-08-19 | 2021-08-23 | Firefox 94 | Firefox 93 | 2021-08-24 | Firefox 92 | Firefox 78.14; 91.1 | |
| 2021-09-16 | 2021-09-20 | Firefox 95 | Firefox 94 | 2021-09-21 | Firefox 93 | Firefox 78.15; 91.2 | |
| Q4 2021 | 2021-10-14 | 2021-10-18 | Firefox 96 | Firefox 95 | 2021-10-19 | Firefox 94 | Firefox 91.3 |
| 2021-11-11 | 2021-11-15 | Firefox 97 | Firefox 96 | 2021-11-16 | Firefox 95 | Firefox 91.4 | |
| 2021-12-09 | 2021-12-13 | Firefox 98 | Firefox 97 | 2021-12-14 | Firefox 96 | Firefox 91.5 | |
| Q1 2022 | 2022-01-20 | 2022-01-24 | Firefox 99 | Firefox 98 | 2022-01-25 | Firefox 97 | Firefox 91.6 |
The Nightly soft freeze is typically during the week prior to merge day. During this period high-risk patches should avoid landing until after the Nightly version bump lands on mozilla-central on merge day.
Past branch dates
More details on contents of releases can be found in the release notes archive or Wikipedia: Firefox version history.
| Soft Freeze | Merge Date | Central | Beta | Release Date | Release | ESR |
|---|---|---|---|---|---|---|
| 2021-04-15 | 2021-04-19 | Firefox 90 | Firefox 89 | 2021-04-19 | Firefox 88 | Firefox 78.10 |
| 2021-03-18 | 2021-03-22 | Firefox 89 | Firefox 88 | 2021-03-23 | Firefox 87 | Firefox 78.9 |
| 2021-02-18 | 2021-02-22 | Firefox 88 | Firefox 87 | 2021-02-23 | Firefox 86 | Firefox 78.8 |
| 2021-01-21 | 2021-01-25 | Firefox 87 | Firefox 86 | 2021-01-26 | Firefox 85 | Firefox 78.7 |
| 2020-12-10 | 2020-12-14 | Firefox 86 | Firefox 85 | 2020-12-15 | Firefox 84 | Firefox 78.6 |
| 2020-11-12 | 2020-11-16 | Firefox 85 | Firefox 84 | 2020-11-17 | Firefox 83 | Firefox 78.5 |
| 2020-10-15 | 2020-10-19 | Firefox 84 | Firefox 83 | 2020-10-20 | Firefox 82 | Firefox 78.4 |
| 2020-09-17 | 2020-09-21 | Firefox 83 | Firefox 82 | 2020-09-22 | Firefox 81 | Firefox 78.3 |
| 2020-08-20 | 2020-08-24 | Firefox 82 | Firefox 81 | 2020-08-25 | Firefox 80 | Firefox 68.12; 78.2 |
| 2020-07-23 | 2020-07-27 | Firefox 81 | Firefox 80 | 2020-07-28 | Firefox 79 | Firefox 68.11; 78.1 |
| 2020-06-26 | 2020-06-29 | Firefox 80 | Firefox 79 | 2020-06-30 | Firefox 78 | Firefox 68.10; 78.0 |
| 2020-05-28 | 2020-06-01 | Firefox 79 | Firefox 78 | 2020-06-02 | Firefox 77 | Firefox 68.9 |
| 2020-04-30 | 2020-05-04 | Firefox 78 | Firefox 77 | 2020-05-05 | Firefox 76 | Firefox 68.8 |
| 2020-04-02 | 2020-04-06 | Firefox 77 | Firefox 76 | 2020-04-07 | Firefox 75 | Firefox 68.7 |
| 2020-03-05 | 2020-03-09 | Firefox 76 | Firefox 75 | 2020-03-10 | Firefox 74 | Firefox 68.6 |
| 2020-02-06 | 2020-02-10 | Firefox 75 | Firefox 74 | 2020-02-11 | Firefox 73 | Firefox 68.5 |
| 2020-01-02 | 2020-01-06 | Firefox 74 | Firefox 73 | 2020-01-07 | Firefox 72 | Firefox 68.4 |
| 2019-11-25 | 2019-12-02 | Firefox 73 | Firefox 72 | 2019-12-03 | Firefox 71 | Firefox 68.3 |
| 2019-10-14 | 2019-10-21 | Firefox 72 | Firefox 71 | 2019-10-22 | Firefox 70 | Firefox 68.2 |
| 2019-08-26 | 2019-09-02 | Firefox 71 | Firefox 70 | 2019-09-03 | Firefox 69 | Firefox 60.9; 68.1 |
| 2019-07-01 | 2019-07-08 | Firefox 70 | Firefox 69 | 2019-07-09 | Firefox 68 | Firefox 60.8; 68.0 |
| 2019-05-13 | 2019-05-20 | Firefox 69 | Firefox 68 | 2019-05-21 | Firefox 67 | Firefox 60.7 |
| 2019-03-11 | 2019-03-18 | Firefox 68 | Firefox 67 | 2019-03-19 | Firefox 66 | Firefox 60.6 |
| 2019-01-21 | 2019-01-28 | Firefox 67 | Firefox 66 | 2019-01-29 | Firefox 65 | Firefox 60.5 |
| 2018-12-03 | 2018-12-10 | Firefox 66 | Firefox 65 | 2018-12-11 | Firefox 64 | Firefox 60.4 |
| 2018-10-15 | 2018-10-22 | Firefox 65 | Firefox 64 | 2018-10-23 | Firefox 63 | Firefox 60.3 |
| Merge Date | Central | Beta | Release Date | Release | ESR |
|---|---|---|---|---|---|
| 2018-09-04 | Firefox 64 | Firefox 63 | 2018-09-05 | Firefox 62 | Firefox 60.2 |
| 2018-06-25 | Firefox 63 | Firefox 62 | 2018-06-26 | Firefox 61 | Firefox 52.9; 60.1 |
| 2018-05-07 | Firefox 62 | Firefox 61 | 2018-05-09 | Firefox 60 | Firefox 52.8; 60.0 |
| 2018-03-12 | Firefox 61 | Firefox 60 | 2018-03-13 | Firefox 59 | Firefox 52.7 |
| 2018-01-22 | Firefox 60 | Firefox 59 | 2018-01-23 | Firefox 58 | Firefox 52.6 |
| 2017-11-13 | Firefox 59 | Firefox 58 | 2017-11-14 | Firefox 57 | Firefox 52.5 |
| 2017-09-21 | Firefox 58 | Firefox 57 | 2017-09-28 | Firefox 56 | Firefox 52.4 |
| 2017-08-02 | Firefox 57 | Firefox 56 | 2017-08-08 | Firefox 55 | Firefox 52.3 |
| 2017-06-12 | Firefox 56 | Firefox 55 | 2017-06-13 | Firefox 54 | Firefox 52.2 |
| 2017-04-18 | Firefox 55 | Firefox 54 | 2017-04-19 | Firefox 53 | Firefox 45.9; 52.1 |
| Merge Date | Central | Aurora | Beta | Release Date | Release | ESR |
|---|---|---|---|---|---|---|
| 2017-03-06 | Firefox 55 | Firefox 54 | Firefox 53 | 2017-03-07 | Firefox 52 | Firefox 45.8; 52.0 |
| 2017-01-23 | Firefox 54 | Firefox 53 | Firefox 52 | 2017-01-24 | Firefox 51 | Firefox 45.7 |
| 2016-12-13 | Firefox 50.1.0 | Firefox 45.6 | ||||
| 2016-11-14 | Firefox 53 | Firefox 52 | Firefox 51 | 2016-11-15 | Firefox 50 | Firefox 45.5 |
| 2016-09-19 | Firefox 52 | Firefox 51 | Firefox 50 | 2016-09-20 | Firefox 49 | Firefox 45.4 |
| 2016-08-01 | Firefox 51 | Firefox 50 | Firefox 49 | 2016-08-02 | Firefox 48 | Firefox 45.3 |
| 2016-06-06 | Firefox 50 | Firefox 49 | Firefox 48 | 2016-06-07 | Firefox 47 | Firefox 45.2 |
| 2016-04-25 | Firefox 49 | Firefox 48 | Firefox 47 | 2016-04-26 | Firefox 46 | Firefox 38.8; 45.1 |
| 2016-03-07 | Firefox 48 | Firefox 47 | Firefox 46 | 2016-03-08 | Firefox 45 | Firefox 38.7; 45.0 |
| 2016-01-25 | Firefox 47 | Firefox 46 | Firefox 45 | 2016-01-26 | Firefox 44 | Firefox 38.6 |
| 2015-12-14 | Firefox 46 | Firefox 45 | Firefox 44 | 2015-12-15 | Firefox 43 | Firefox 38.5 |
| 2015-10-29 | Firefox 45 | Firefox 44 | Firefox 43 | 2015-11-03 | Firefox 42 | Firefox 38.4 |
| 2015-09-21 | Firefox 44 | Firefox 43 | Firefox 42 | 2015-09-22 | Firefox 41 | Firefox 38.3 |
| 2015-08-10 | Firefox 43 | Firefox 42 | Firefox 41 | 2015-08-11 | Firefox 40 | Firefox 38.2 |
| 2015-06-29 | Firefox 42 | Firefox 41 | Firefox 40 | 2015-06-30 | Firefox 39 | Firefox 31.8; 38.1 |
| 2015-06-02 | Firefox 38.0.5 | |||||
| 2015-05-11* | Firefox 41 | Firefox 40 | Firefox 39 | 2015-05-12* | Firefox 38 | Firefox 31.7; 38.0 |
| 2015-03-30* | Firefox 40 | Firefox 39 | Firefox 38 | 2015-03-31* | Firefox 37 | Firefox 31.6 |
| 2015-02-23 | Firefox 39 | Firefox 38 | Firefox 37 | 2015-02-24 | Firefox 36 | Firefox 31.5 |
| 2015-01-12* | Firefox 38 | Firefox 37 | Firefox 36 | 2015-01-13* | Firefox 35 | Firefox 31.4 |
| 2014-11-28* | Firefox 37 | Firefox 36 | Firefox 35 | 2014-12-01* | Firefox 34 | Firefox 31.3 |
| 2014-10-13 | Firefox 36 | Firefox 35 | Firefox 34 | 2014-10-14 | Firefox 33 | Firefox 31.2 |
| 2014-09-02* | Firefox 35 | Firefox 34 | Firefox 33 | 2014-09-02 | Firefox 32 | Firefox 24.8; 31.1 |
| 2014-07-21 | Firefox 34 | Firefox 33 | Firefox 32 | 2014-07-22 | Firefox 31 | Firefox 24.7; 31.0 |
| 2014-06-09 | Firefox 33 | Firefox 32 | Firefox 31 | 2014-06-10 | Firefox 30 | Firefox 24.6 |
| 2014-04-28 | Firefox 32 | Firefox 31 | Firefox 30 | 2014-04-29 | Firefox 29 | Firefox 24.5 |
| 2014-03-17 | Firefox 31 | Firefox 30 | Firefox 29 | 2014-03-18 | Firefox 28 | Firefox 24.4 |
| 2014-02-03* | Firefox 30 | Firefox 29 | Firefox 28 | 2014-02-04* | Firefox 27 | Firefox 24.3 |
| 2013-12-09 | Firefox 29 | Firefox 28 | Firefox 27 | 2013-12-10 | Firefox 26 | Firefox 24.2 |
| 2013-10-28 | Firefox 28 | Firefox 27 | Firefox 26 | 2013-10-29 | Firefox 25 | Firefox 17.0.10; 24.1 |
| 2013-09-16 | Firefox 27 | Firefox 26 | Firefox 25 | 2013-09-17 | Firefox 24 | Firefox 17.0.9; 24.0 |
| 2013-08-05 | Firefox 26 | Firefox 25 | Firefox 24 | 2013-08-06 | Firefox 23 | Firefox 17.0.8 |
| 2013-06-24 | Firefox 25 | Firefox 24 | Firefox 23 | 2013-06-25 | Firefox 22 | Firefox 17.0.7 |
| 2013-05-13 | Firefox 24 | Firefox 23 | Firefox 22 | 2013-05-14 | Firefox 21 | Firefox 17.0.6 |
| 2013-04-01 | Firefox 23 | Firefox 22 | Firefox 21 | 2013-04-02 | Firefox 20 | Firefox 17.0.5 |
| 2013-02-19* | Firefox 22 | Firefox 21 | Firefox 20 | 2013-02-19 | Firefox 19 | Firefox 17.0.3 |
| 2013-01-07* | Firefox 21 | Firefox 20 | Firefox 19 | 2013-01-08* | Firefox 18 | Firefox 10.0.12; 17.0.2 |
| 2012-11-19 | Firefox 20 | Firefox 19 | Firefox 18 | 2012-11-20 | Firefox 17 | Firefox 10.0.11; 17.0 |
| 2012-10-08 | Firefox 19 | Firefox 18 | Firefox 17 | 2012-10-09 | Firefox 16 | Firefox 10.0.8 |
| 2012-08-27 | Firefox 18 | Firefox 17 | Firefox 16 | 2012-08-28 | Firefox 15 | Firefox 10.0.7 |
| 2012-07-16 | Firefox 17 | Firefox 16 | Firefox 15 | 2012-07-17 | Firefox 14 | Firefox 10.0.6 |
| 2012-06-05 | Firefox 16 | Firefox 15 | Firefox 14 | 2012-06-05 | Firefox 13 | Firefox 10.0.5 |
| 2012-04-24 | Firefox 15 | Firefox 14 | Firefox 13 | 2012-04-24 | Firefox 12 | Firefox 10.0.4 |
| 2012-03-13 | Firefox 14 | Firefox 13 | Firefox 12 | 2012-03-13 | Firefox 11 | Firefox 10.0.3 |
| 2012-01-31 | Firefox 13 | Firefox 12 | Firefox 11 | 2012-01-31 | Firefox 10 | Firefox 10.0 |
| 2011-12-20 | Firefox 12 | Firefox 11 | Firefox 10 | 2011-12-20 | Firefox 9 | |
| 2011-11-08 | Firefox 11 | Firefox 10 | Firefox 9 | 2011-11-08 | Firefox 8 | |
| 2011-09-27 | Firefox 10 | Firefox 9 | Firefox 8 | 2011-09-27 | Firefox 7 | |
| 2011-08-16 | Firefox 9 | Firefox 8 | Firefox 7 | 2011-08-16 | Firefox 6 | |
| 2011-07-05 | Firefox 8 | Firefox 7 | Firefox 6 | |||
| 2011-06-21 | Firefox 5 | |||||
| 2011-05-24 | Firefox 7 | Firefox 6 | ||||
| 2011-05-17 | Firefox 5 | |||||
| 2011-04-12 | Firefox 6 | Firefox 5 |
*Some release dates and merge dates are rescheduled to avoid conflicts with holidays.
Information About Mozilla Firefox
Notes:
- Four week schedule starting late 2019.
- Irregular schedule targeting six to eight week intervals, adjusting for holidays, starting 2016.
- Six week schedule from 2011 to 2015 (with some dates delayed to avoid conflicts with holidays).
- Firefox 5 was on a slightly different schedule. It spent five weeks each on Aurora and Beta while later releases spent six weeks on each branch.
All About Mozilla Firefox