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Lifecycle

Mozilla Product Lifecycle

Release dates, version history and end-of-support dates for 3 Mozilla products and 234 versions.

Releases and Lifecycle

Upcoming End of Support

Release dates, version history and support and end-of-life dates as published by Mozilla. Dates within the next 12 months are highlighted; past dates are dimmed. Retrieved 2026-10-14.

  • Firefox release calendar. Mozilla publishes a Firefox release calendar that maps each Firefox release date to the matching Firefox ESR releases. [3]
Firefox 160 versions

Release dates only; Mozilla's release data lists no end-of-support date per release.

VersionReleasedSource
158.0[1]
157.0[1]
156.0[1]
155.0[1]
154.0[1]
153.0[1]
152.0[1]
151.0[1]
150.0[1]
149.0[1]
148.0[1]
147.0[1]
146.0[1]
145.0[1]
144.0[1]
143.0[1]
142.0[1]
141.0[1]
140.0[1]
139.0[1]
138.0[1]
137.0[1]
136.0[1]
135.0[1]
134.0[1]
133.0[1]
132.0[1]
131.0[1]
130.0[1]
129.0[1]
128.0[1]
127.0[1]
126.0[1]
124.0[1]
123.0[1]
122.0[1]
121.0[1]
120.0[1]
119.0[1]
118.0[1]
117.0[1]
116.0[1]
115.0[1]
114.0[1]
113.0[1]
112.0[1]
111.0[1]
110.0[1]
109.0[1]
108.0[1]
107.0[1]
106.0[1]
105.0[1]
104.0[1]
103.0[1]
102.0[1]
101.0[1]
100.0[1]
99.0[1]
98.0[1]
97.0[1]
96.0[1]
95.0[1]
94.0[1]
93.0[1]
92.0[1]
91.0[1]
90.0[1]
89.0[1]
88.0[1]
87.0[1]
86.0[1]
85.0[1]
84.0[1]
83.0[1]
82.0[1]
81.0[1]
80.0[1]
79.0[1]
78.0[1]
77.0[1]
76.0[1]
75.0[1]
74.0[1]
73.0[1]
72.0[1]
71.0[1]
70.0[1]
69.0[1]
68.0[1]
67.0[1]
66.0[1]
65.0[1]
64.0[1]
63.0[1]
62.0[1]
61.0[1]
60.0[1]
59.0[1]
58.0[1]
57.0[1]
56.0[1]
55.0[1]
54.0[1]
53.0[1]
52.0[1]
51.0[1]
50.0[1]
49.0[1]
48.0[1]
47.0[1]
46.0[1]
45.0[1]
44.0[1]
43.0[1]
42.0[1]
41.0[1]
40.0[1]
39.0[1]
38.0[1]
37.0[1]
36.0[1]
35.0[1]
34.0[1]
33.1[1]
33.0[1]
32.0[1]
31.0[1]
30.0[1]
29.0[1]
28.0[1]
27.0[1]
26.0[1]
25.0[1]
24.0[1]
23.0[1]
22.0[1]
21.0[1]
20.0[1]
19.0[1]
18.0[1]
17.0[1]
16.0[1]
15.0[1]
13.0[1]
12.0[1]
11.0[1]
10.0[1]
9.0[1]
8.0[1]
7.0[1]
6.0[1]
5.0[1]
4.0[1]
3.6[1]
3.5[1]
3.0[1]
2.0[1]
1.5[1]
1.0[1]
Firefox ESR 13 versions

First release of each ESR line; the release calendar shows ESR dot releases but the public pages checked state no end-of-support dates.

VersionReleasedSource
153 ESR[1]
140 ESR[1]
128 ESR[1]
115 ESR[1]
102 ESR[1]
91 ESR[1]
78 ESR[1]
68 ESR[1]
60 ESR[1]
52 ESR[1]
38 ESR[1]
31 ESR[1]
24 ESR[1]
Thunderbird 61 versions

Release dates only; Mozilla's release data lists no end-of-support date per release.

VersionReleasedSource
158.0[2]
157.0[2]
156.0[2]
155.0[2]
154.0[2]
153.0[2]
152.0[2]
151.0[2]
150.0[2]
149.0[2]
148.0[2]
147.0[2]
146.0[2]
145.0[2]
144.0[2]
143.0[2]
142.0[2]
141.0[2]
140.0[2]
139.0[2]
138.0[2]
137.0[2]
136.0[2]
135.0[2]
134.0[2]
133.0[2]
132.0[2]
131.0[2]
130.0[2]
129.0[2]
128.0[2]
127.0[2]
125.0[2]
115.0[2]
102.0[2]
91.0[2]
78.0[2]
68.0[2]
60.0[2]
52.0[2]
45.0[2]
31.0[2]
24.0[2]
17.0[2]
16.0[2]
15.0[2]
14.0[2]
13.0[2]
12.0[2]
11.0[2]
10.0[2]
9.0[2]
8.0[2]
7.0[2]
6.0[2]
5.0[2]
3.1[2]
3.0[2]
2.0[2]
1.5[2]
1.0[2]
Sources 3
  1. Mozilla product details: Firefox releases retrieved 2026-10-14
  2. Mozilla product details: Thunderbird releases retrieved 2026-10-14
  3. Firefox Release Calendar retrieved 2026-10-14
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