Download Firefox

Firefox is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Privacy Notice

Security Advisories for Firefox

Impact key

  • Critical Vulnerability can be used to run attacker code and install software, requiring no user interaction beyond normal browsing.
  • High Vulnerability can be used to gather sensitive data from sites in other windows or inject data or code into those sites, requiring no more than normal browsing actions.
  • Moderate Vulnerabilities that would otherwise be High or Critical except they only work in uncommon non-default configurations or require the user to perform complicated and/or unlikely steps.
  • Low Minor security vulnerabilities such as Denial of Service attacks, minor data leaks, or spoofs. (Undetectable spoofs of SSL indicia would have "High" impact because those are generally used to steal sensitive data intended for other sites.)

# Fixed in Firefox 123

# Fixed in Firefox 122

# Fixed in Firefox 121

# Fixed in Firefox 120

# Fixed in Firefox 119

# Fixed in Firefox 118.0.1

# Fixed in Firefox 118

# Fixed in Firefox 117.0.1

# Fixed in Firefox 117

# Fixed in Firefox 116

# Fixed in Firefox 115.0.2

# Fixed in Firefox 115

# Fixed in Firefox 114

# Fixed in Firefox 113

# Fixed in Firefox 112

# Fixed in Firefox 111

# Fixed in Firefox 110

# Fixed in Firefox 109

# Fixed in Firefox 108

# Fixed in Firefox 107

# Fixed in Firefox 106

# Fixed in Firefox 105

# Fixed in Firefox 104

# Fixed in Firefox 103

# Fixed in Firefox 102

# Fixed in Firefox 101

# Fixed in Firefox 100.0.2

# Fixed in Firefox 100

# Fixed in Firefox 99

# Fixed in Firefox 98

# Fixed in Firefox 97.0.2

# Fixed in Firefox 97

# Fixed in Firefox 96

# Fixed in Firefox 95

# Fixed in Firefox 94

# Fixed in Firefox 93

# Fixed in Firefox 92

# Fixed in Firefox 91.0.1

# Fixed in Firefox 91

# Fixed in Firefox 90

# Fixed in Firefox 89.0.1

# Fixed in Firefox 89

# Fixed in Firefox 88.0.1

# Fixed in Firefox 88

# Fixed in Firefox 87

# Fixed in Firefox 86

# Fixed in Firefox 85.0.1

# Fixed in Firefox 85

# Fixed in Firefox 84.0.2

# Fixed in Firefox 84

# Fixed in Firefox 83

# Fixed in Firefox 82.0.3

# Fixed in Firefox 82

# Fixed in Firefox 81

# Fixed in Firefox 80

# Fixed in Firefox 79

# Fixed in Firefox 78.0.2

# Fixed in Firefox 78

# Fixed in Firefox 77

# Fixed in Firefox 76

# Fixed in Firefox 75

# Fixed in Firefox 74.0.1

# Fixed in Firefox 74

# Fixed in Firefox 73

# Fixed in Firefox 72.0.1

# Fixed in Firefox 72

# Fixed in Firefox 71

# Fixed in Firefox 70

# Fixed in Firefox 69.0.1

# Fixed in Firefox 69

# Fixed in Firefox 68.10.1

# Fixed in Firefox 68.0.2

# Fixed in Firefox 68

# Fixed in Firefox 67.0.4

# Fixed in Firefox 67.0.3

# Fixed in Firefox 67.0.2

# Fixed in Firefox 67

# Fixed in Firefox 66.0.1

# Fixed in Firefox 66

# Fixed in Firefox 65.0.1

# Fixed in Firefox 65

# Fixed in Firefox 64

# Fixed in Firefox 63

# Fixed in Firefox 62.0.3

# Fixed in Firefox 62.0.2

# Fixed in Firefox 62

# Fixed in Firefox 61

# Fixed in Firefox 60.0.2

# Fixed in Firefox 60

# Fixed in Firefox 59.0.2

# Fixed in Firefox 59.0.1

# Fixed in Firefox 59

# Fixed in Firefox 58.0.1

# Fixed in Firefox 58

# Fixed in Firefox 57.0.4

# Fixed in Firefox 57.0.2

# Fixed in Firefox 57.0.1

# Fixed in Firefox 57

# Fixed in Firefox 56

# Fixed in Firefox 55

# Fixed in Firefox 54

# Fixed in Firefox 53.0.2

# Fixed in Firefox 53

# Fixed in Firefox 52.0.1

# Fixed in Firefox 52

# Fixed in Firefox 51.0.3

# Fixed in Firefox 51

# Fixed in Firefox 50.1

# Fixed in Firefox 50.0.2

# Fixed in Firefox 50.0.1

# Fixed in Firefox 50

# Fixed in Firefox 49.0.2

# Fixed in Firefox 49

# Fixed in Firefox 48

# Fixed in Firefox 47

# Fixed in Firefox 46

# Fixed in Firefox 45

# Fixed in Firefox 44.0.2

# Fixed in Firefox 44

# Fixed in Firefox 43.0.2

# Fixed in Firefox 43

# Fixed in Firefox 42

# Fixed in Firefox 41.0.2

# Fixed in Firefox 41

# Fixed in Firefox 40.0.3

# Fixed in Firefox 40

# Fixed in Firefox 39.0.3

# Fixed in Firefox 39

# Fixed in Firefox 38

# Fixed in Firefox 37.0.2

# Fixed in Firefox 37.0.1

# Fixed in Firefox 37

# Fixed in Firefox 36.0.4

# Fixed in Firefox 36.0.3

# Fixed in Firefox 36

# Fixed in Firefox 35

# Fixed in Firefox 34

# Fixed in Firefox 33

# Fixed in Firefox 32.0.3

# Fixed in Firefox 32

# Fixed in Firefox 31.1

# Fixed in Firefox 31

# Fixed in Firefox 30

# Fixed in Firefox 29

# Fixed in Firefox 28.0.1

# Fixed in Firefox 28

# Fixed in Firefox 27

# Fixed in Firefox 26

# Fixed in Firefox 25.0.1

# Fixed in Firefox 25

# Fixed in Firefox 24

# Fixed in Firefox 23

# Fixed in Firefox 22

# Fixed in Firefox 21

# Fixed in Firefox 20

# Fixed in Firefox 19.0.2

# Fixed in Firefox 19

# Fixed in Firefox 18

# Fixed in Firefox 17.0.9

# Fixed in Firefox 17

# Fixed in Firefox 16.0.2

# Fixed in Firefox 16.0.1

# Fixed in Firefox 16

# Fixed in Firefox 15

# Fixed in Firefox 14

# Fixed in Firefox 13

# Fixed in Firefox 12

# Fixed in Firefox 11

# Fixed in Firefox 10.0.2

# Fixed in Firefox 10.0.1

# Fixed in Firefox 10

# Fixed in Firefox 9

# Fixed in Firefox 8

# Fixed in Firefox 7

# Fixed in Firefox 6.0.2

# Fixed in Firefox 6.0.1

# Fixed in Firefox 6

# Fixed in Firefox 5

# Fixed in Firefox 4.0.1