Firefox

Channels and release schedule

In March 2011, Mozilla made a change to make Firefox get new versions faster, like Google Chrome. This helped Firefox add new features more quickly. The new plan split the release process into four "channels." Each new version moved from one channel to the next over several weeks.

In 2017, Mozilla removed one of these channels because not many people used it. By 2020, Firefox began releasing new versions every four weeks to match Chrome. Chrome made the same change a year later.

Licensing

Firefox source code is free software. This means anyone can see, change, or share its code. Most of it uses the Mozilla Public License. This is a special rule that lets people use the software freely. Many different apps have been made from Firefox’s code. Examples include the old version Netscape, the customizable Pale Moon, and the privacy-focused Tor Browser.

In the past, Firefox used different rules. Now it uses simpler rules so more developers can use and change its code in many ways.

Logo and visual identity

The Firefox icon is a special sign that shows it is the real version of the Firefox web browser. Other versions that change the browser cannot use this icon.

The Firefox logo has changed many times since it started. In 2004, a new logo showed a stylized fox, even though “firefox” is usually the name for a red panda. In 2017, the logo was made to look sleeker, and in 2019, it was changed again to connect Firefox to its other apps and services. In 2026, Mozilla introduced a new mascot named Kit, a friendly fox that appears in Firefox’s design.

• Logo history

• Logo of "Phoenix" and "Firebird" before being renamed as Firefox

• Firefox 0.8–0.10, from February 9, 2004 to November 8, 2004

• Firefox 1.0–3.0, from November 9, 2004 to June 29, 2009

• Firefox 3.5–22, from June 30, 2009 to August 5, 2013

• Firefox 23–56, from August 6, 2013 to November 13, 2017

• Firefox 57–69, from November 14, 2017 to October 21, 2019

• Firefox 70 or later, since October 22, 2019

• Other logos, used for nightly versions

• The 2011 Nightly logo, used to represent nightly builds of pre-alpha versions

• The 2013 Nightly logo

• The 2017 Nightly logo

• The 2019 Nightly logo

• Other logos, used for developer/aurora versions

• The 2011 Aurora logo, used to represent an alpha release

• The 2013 Aurora logo

• The 2015 Developer Edition logo

• The 2017 Developer Edition logo

• The 2019 Developer Edition logo

• Other logos

• Blue globe artwork, distributed with the source code, and is explicitly not protected as a trademark

• The logo for the Firefox brand of products and services, as of July 2019.

Trademark

The name "Mozilla Firefox" is a registered trademark of Mozilla. This means only Mozilla can use the official Firefox logo and name under specific conditions. People can share the original Firefox files and use its name, but if they change the code, they cannot use the Firefox name or logo.

The name "Firefox" comes from a nickname for the red panda. Mozilla has rules to make sure everyone has a consistent experience when using Firefox. There was some discussion when certain open-source groups wanted to use the Firefox name after changing the code. To solve this, Firefox has a special "branding switch" that lets developers create versions without the official logo or name. For example, when Debian changed Firefox, they renamed it Iceweasel instead.

Promotion

Firefox became very popular quickly. It had 100 million downloads in its first year. To help it grow, Firefox started many marketing campaigns. In 2004, they made a website called Spread Firefox to share ideas and encourage people to tell others about Firefox. They even put a large ad in The New York Times with the names of people who helped support Firefox.

Firefox also did fun things to get attention, like making a large Firefox logo in a field of plants. In 2017, they worked with a comedian to make TV ads and social media posts to celebrate a new version of Firefox called Quantum.

Performance

In the 2000s, Firefox 1.5 used more memory than other browsers because of a new feature, but later versions got better. Firefox sometimes started slower than others, but updates made it faster.

In the 2010s, Firefox kept getting better. Tests showed it could be as fast or faster than other browsers in some areas, especially with memory use and handling many tabs. By 2017, Firefox Quantum was rated the fastest browser in some tests.

In 2023, a fix for a Windows mistake helped Firefox run better. As of September 2025, Firefox had a market share of 4.45%.

Usage share

Further information: Usage share of web browsers

Firefox has been very popular since it started. By July 2009, people had downloaded it over one billion times. In July 2010, IBM asked its workers to use Firefox as their main browser.

For many years, Firefox was the second most used web browser. But in 2011, Google Chrome became more popular. By October 2024, Firefox was the fourth most used desktop browser, with about 2.95% of users around the world. Its popularity has gone up and down in different countries.

Reception

Firefox has faced some criticism from web developers. They say it can be slower to use new web standards and fix older problems. Some people also say it uses more battery and computer power than other browsers.

In 2025, Mozilla made new rules for using Firefox. This made some people worry about privacy. They were concerned that Mozilla might use user data for artificial intelligence without clear permission. Mozilla said the changes were to make things clearer and more open. They also said they did not own users' data. Later, Mozilla changed some of the words in their privacy statements to address these concerns.