Firefox version history

Firefox was created by Dave Hyatt and Blake Ross as an experimental branch of the Mozilla browser, first released as Firefox 1.0 on November 9, 2004. Starting with version 5.0, a rapid release cycle was put into effect, resulting in a new major version release every six weeks. This was gradually accelerated further in late 2019, so that new major releases occur on four-week cycles starting in 2020.

For specific features, see Features of Firefox.


Market share overview
According to StatCounter data
March 2024
Browser  % of Fx  % of total
Firefox 1 ——
Firefox 2 ——
Firefox 3 ——
Firefox 4 ——
Firefox 5–9 ——
Firefox 10–16 0.36%0.01%
Firefox 17–23 ——
Firefox 24–30 ——
Firefox 31–37 ——
Firefox 38–44 0.36%0.01%
Firefox 45–51 ——
Firefox 52–59 2.51%0.07%
Firefox 60–67 ——
Firefox 68–77 ——
Firefox 78–90 0.72%0.02%
Firefox 91–101 ——
Firefox 102–114 2.87%0.08%
Firefox 115 and 115 ESR 14.34%0.40%
Firefox 116 ——
Firefox 117 0.36%0.01%
Firefox 118 2.87%0.08%
Firefox 119 ——
Firefox 120 0.72%0.02%
Firefox 121 0.72%0.02%
Firefox 122 2.51%0.07%
Firefox 123 44.09%1.23%
Firefox 124 17.92%0.50%
Firefox 125 ——
All variants 100%2.79%
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