Firefox release notes for developers
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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.

1. Firefox 123 for developers
2. Firefox 122 for developers
3. Firefox 121 for developers
4. Firefox 120 for developers
5. Firefox 119 for developers
6. Firefox 118 for developers
7. Firefox 117 for developers
8. Firefox 116 for developers
9. Firefox 115 for developers
10. Firefox 114 for developers
11. Firefox 113 for developers
12. Firefox 112 for developers
13. Firefox 111 for developers
14. Firefox 110 for developers
15. Firefox 109 for developers
16. Firefox 108 for developers
17. Firefox 107 for developers
18. Firefox 106 for developers
19. Firefox 105 for developers
20. Firefox 104 for developers
21. Firefox 103 for developers
22. Firefox 102 for developers
23. Firefox 101 for developers
24. Firefox 100 for developers
25. Firefox 99 for developers
26. Firefox 98 for developers
27. Firefox 97 for developers
28. Firefox 96 for developers
29. Firefox 95 for developers
30. Firefox 94 for developers
31. Firefox 93 for developers
32. Firefox 92 for developers
33. Firefox 91 for developers
34. Firefox 90 for developers
35. Firefox 89 for developers
36. Firefox 88 for developers
37. Firefox 87 for developers
38. Firefox 86 for developers
39. Firefox 85 for developers
40. Firefox 84 for developers
41. Firefox 83 for developers
42. Firefox 82 for developers
43. Firefox 81 for developers
44. Firefox 80 for developers
45. Firefox 79 for developers
46. Firefox 78 for developers
47. Firefox 77 for developers
48. Firefox 76 for developers
49. Firefox 75 for developers
50. Firefox 74 for developers
51. Firefox 73 for developers
52. Firefox 72 for Developers
53. Firefox 71 for Developers
54. Firefox 70 for developers
55. Firefox 69 for developers
56. Firefox 68 for developers
57. Firefox 67 for developers
58. Firefox 66 for developers
59. Firefox 65 for developers
60. Firefox 64 for developers
61. Firefox 63 for developers
62. Firefox 62 for developers
63. Firefox 61 for developers
64. Firefox 60 for developers
65. Firefox 59 for developers
66. Firefox 58 for developers
67. Firefox 57 (Quantum) for developers
68. Firefox 56 for developers
69. Firefox 55 for developers
70. Firefox 54 for developers
71. Firefox 53 for developers
72. Firefox 52 for developers
73. Firefox 51 for developers
74. Firefox 50 for developers
75. Firefox 49 for developers
76. Firefox 48 for developers
77. Firefox 47 for developers
78. Firefox 46 for developers
79. Firefox 45 for developers
80. Firefox 44 for developers
81. Firefox 43 for developers
82. Firefox 42 for developers
83. Firefox 41 for developers
84. Firefox 40 for developers
85. Firefox 39 for developers
86. Firefox 38 for developers
87. Firefox 37 for developers
88. Firefox 36 for developers
89. Firefox 35 for developers
90. Firefox 34 for developers
91. Firefox 33 for developers
92. Firefox 32 for developers
93. Firefox 31 for developers
94. Firefox 30 for developers
95. Firefox 29 for developers
96. Firefox 28 for developers
97. Firefox 27 for developers
98. Firefox 26 for developers
99. Firefox 25 for developers
100. Firefox 24 for developers
101. Firefox 23 for developers
102. Firefox 22 for developers
103. Firefox 21 for developers
104. Firefox 20 for developers
105. Firefox 19 for developers
106. Firefox 18 for developers
107. Firefox 17 for developers
108. Firefox 16 for developers
109. Firefox 15 for developers
110. Firefox 14 for developers
111. Firefox 13 for developers
112. Firefox 12 for developers
113. Firefox 11 for developers
114. Firefox 10 for developers
115. Firefox 9 for developers
116. Firefox 8 for developers
117. Firefox 7 for developers
118. Firefox 6 for developers
119. Firefox 5 for developers
120. Firefox 4 for developers
121. Firefox 3.6 for developers
122. Firefox 3.5 for developers
123. Firefox 3 for developers
124. Firefox 2 for developers
125. Firefox 1.5 for developers

Whew! That's a lot of Firefoxen!