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 63 for developers
  2. Firefox 62 for developers
  3. Firefox 61 for developers
  4. Firefox 60 for developers
  5. Firefox 59 for developers
  6. Firefox 58 for developers
  7. Firefox 57 (Quantum) for developers
  8. Firefox 56 for developers
  9. Firefox 55 for developers
  10. Firefox 54 for developers
  11. Firefox 53 for developers
  12. Firefox 52 for developers
  13. Firefox 51 for developers
  14. Firefox 50 for developers
  15. Firefox 49 for developers
  16. Firefox 48 for developers
  17. Firefox 47 for developers
  18. Firefox 46 for developers
  19. Firefox 45 for developers
  20. Firefox 44 for developers
  21. Firefox 43 for developers
  22. Firefox 42 for developers
  23. Firefox 41 for developers
  24. Firefox 40 for developers
  25. Firefox 39 for developers
  26. Firefox 38 for developers
  27. Firefox 37 for developers
  28. Firefox 36 for developers
  29. Firefox 35 for developers
  30. Firefox 34 for developers
  31. Firefox 33 for developers
  32. Firefox 32 for developers
  33. Firefox 31 for developers
  34. Firefox 30 for developers
  35. Firefox 29 for developers
  36. Firefox 28 for developers
  37. Firefox 27 for developers
  38. Firefox 26 for developers
  39. Firefox 25 for developers
  40. Firefox 24 for developers
  41. Firefox 23 for developers
  42. Firefox 22 for developers
  43. Firefox 21 for developers
  44. Firefox 20 for developers
  45. Firefox 19 for developers
  46. Firefox 18 for developers
  47. Firefox 17 for developers
  48. Firefox 16 for developers
  49. Firefox 15 for developers
  50. Firefox 14 for developers
  51. Firefox 13 for developers
  52. Firefox 12 for developers
  53. Firefox 11 for developers
  54. Firefox 10 for developers
  55. Firefox 9 for developers
  56. Firefox 8 for developers
  57. Firefox 7 for developers
  58. Firefox 6 for developers
  59. Firefox 5 for developers
  60. Firefox 4 for developers
  61. Firefox 3.6 for developers
  62. Firefox 3.5 for developers
  63. Firefox 3 for developers
  64. Firefox 2 for developers
  65. Firefox 1.5 for developers
 
Whew! That's a lot of Firefoxen!

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Contributors to this page: Sheppy, wbamberg, jswisher, ziyunfei
Last updated by: Sheppy,