Firefox version history


Market share overview
According to StatCounter data
May 2025
Browser  % of Fx  % of total
Firefox 1 ——
Firefox 2 ——
Firefox 3 ——
Firefox 4 ——
Firefox 5–9 ——
Firefox 10–16 2.93%0.07%
Firefox 17–23 ——
Firefox 24–30 ——
Firefox 31–37 ——
Firefox 38–44 ——
Firefox 45–51 ——
Firefox 52–59 1.26%0.03%
Firefox 60–67 ——
Firefox 68–77 ——
Firefox 78–90 0.42%0.01%
Firefox 91–101 ——
Firefox 102–114 ——
Firefox 115 and 115 ESR 8.37%0.20%
Firefox 116 ——
Firefox 117 ——
Firefox 118 4.18%0.10%
Firefox 119 ——
Firefox 120 ——
Firefox 121 ——
Firefox 122 ——
Firefox 123 ——
Firefox 124 ——
Firefox 125 ——
Firefox 126 ——
Firefox 127 ——
Firefox 128 and 128 ESR 4.18%0.10%
Firefox 129 ——
Firefox 130 ——
Firefox 131 ——
Firefox 132 ——
Firefox 133 0.42%0.01%
Firefox 134 0.42%0.01%
Firefox 135 0.84%0.02%
Firefox 136 1.67%0.04%
Firefox 137 6.70%0.16%
Firefox 138 56.07%1.34%
Firefox 139 4.60%0.11%
Firefox 140 and 140 ESR ——
All variants 100%2.39%

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.

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