Upcoming Firefox release milestones

December 2023
SMTWTFS
1
121 b6 GTB
122 build ready for nightly QA
2
3
4
121 b7 GTB
SUMO content localization starts
5
6
121 b8 GTB
121 QA sign off
7
8
121 b9 GTB
9
10
11
121 go to Build
12
RC
13
122 build ready for beta QA
14
122 soft Code Freeze starts at 08:00 UTC
15
Final deadline for QA’s Feature Test Plan approval
String Freeze
122 regression testing completed
16
17
18
Merge day
122 b1 GTB
Nightly 123 starts
19
121 Release
20
122 b2 GTB
21
22
122 b3 GTB
SUMO deadline
123 QA request deadline for Nightly
23
24
25
26
27
28
29
122 b4 GTB
123 build ready for nightly QA
30
31

January 2024
SMTWTFS
1
2
3
122 b5 GTB
4
5
122 b6 GTB
6
7
8
122 b7 GTB
SUMO content localization starts
9
Planned 121.0.x
10
122 b8 GTB
122 QA sign off
123 build ready for beta QA
11
123 soft Code Freeze starts at 08:00 UTC
12
122 b9 GTB
Final deadline for QA’s Feature Test Plan approval
String Freeze
123 regression testing completed
13
14
15
122 go to Build
16
RC
17
18
19
20
21
22
Merge day
123 b1 GTB
Nightly 124 starts
23
122 Release
24
123 b2 GTB
25
26
123 b3 GTB
SUMO deadline
124 QA request deadline for Nightly
27
28
29
123 b4 GTB
30
31
123 b5 GTB

February 2024
SMTWTFS
1
2
123 b6 GTB
124 build ready for nightly QA
3
4
5
123 b7 GTB
SUMO content localization starts
6
Planned 122.0.x
7
123 b8 GTB
123 QA sign off
8
9
123 b9 GTB
10
11
12
123 go to Build
13
RC
14
124 build ready for beta QA
15
124 soft Code Freeze starts at 08:00 UTC
16
Final deadline for QA’s Feature Test Plan approval
String Freeze
124 regression testing completed
17
18
19
Merge day
124 b1 GTB
Nightly 125 starts
20
123 Release
21
124 b2 GTB
22
23
124 b3 GTB
SUMO deadline
125 QA request deadline for Nightly
24
25
26
124 b4 GTB
27
28
124 b5 GTB
29

March 2024
SMTWTFS
1
124 b6 GTB
125 build ready for nightly QA
2
3
4
124 b7 GTB
SUMO content localization starts
5
Planned 123.0.x
6
124 b8 GTB
124 QA sign off
7
8
124 b9 GTB
9
10
11
124 go to Build
12
RC
13
125 build ready for beta QA
14
125 soft Code Freeze starts at 08:00 UTC
15
Final deadline for QA’s Feature Test Plan approval
String Freeze
125 regression testing completed
16
17
18
Merge day
125 b1 GTB
Nightly 126 starts
19
124 Release
20
125 b2 GTB
21
22
125 b3 GTB
SUMO deadline
126 QA request deadline for Nightly
23
24
25
125 b4 GTB
26
27
125 b5 GTB
28
29
125 b6 GTB
126 build ready for nightly QA
30
31

April 2024
SMTWTFS
1
125 b7 GTB
SUMO content localization starts
2
Planned 124.0.x
3
125 b8 GTB
125 QA sign off
4
5
125 b9 GTB
6
7
8
125 go to Build
9
RC
10
126 build ready for beta QA
11
126 soft Code Freeze starts at 08:00 UTC
12
Final deadline for QA’s Feature Test Plan approval
String Freeze
126 regression testing completed
13
14
15
Merge day
126 b1 GTB
Nightly 127 starts
16
125 Release
17
126 b2 GTB
18
19
126 b3 GTB
SUMO deadline
127 QA request deadline for Nightly
20
21
22
126 b4 GTB
23
24
126 b5 GTB
25
26
126 b6 GTB
127 build ready for nightly QA
27
28
29
126 b7 GTB
SUMO content localization starts
30
Planned 125.0.x

May 2024
SMTWTFS
1
126 b8 GTB
126 QA sign off
2
3
126 b9 GTB
4
5
6
126 go to Build
7
RC
8
127 build ready for beta QA
9
127 soft Code Freeze starts at 08:00 UTC
10
Final deadline for QA’s Feature Test Plan approval
String Freeze
127 regression testing completed
11
12
13
Merge day
127 b1 GTB
Nightly 128 starts
14
126 Release
15
127 b2 GTB
16
17
127 b3 GTB
SUMO deadline
128 QA request deadline for Nightly
18
19
20
127 b4 GTB
21
22
127 b5 GTB
23
24
127 b6 GTB
128 build ready for nightly QA
25
26
27
127 b7 GTB
SUMO content localization starts
28
Planned 126.0.x
29
127 b8 GTB
127 QA sign off
30
31
127 b9 GTB

June 2024
SMTWTFS
1
2
3
127 go to Build
4
RC
5
128 build ready for beta QA
6
128 soft Code Freeze starts at 08:00 UTC
7
Final deadline for QA’s Feature Test Plan approval
String Freeze
128 regression testing completed
8
9
10
Merge day
128 b1 GTB
Nightly 129 starts
11
127 Release
12
128 b2 GTB
13
14
128 b3 GTB
SUMO deadline
129 QA request deadline for Nightly
15
16
17
128 b4 GTB
18
19
128 b5 GTB
20
21
128 b6 GTB
129 build ready for nightly QA
22
23
24
128 b7 GTB
SUMO content localization starts
25
Planned 127.0.x
26
128 b8 GTB
128 QA sign off
27
28
128 b9 GTB
29
30

July 2024
SMTWTFS
1
128 go to Build
2
RC
3
129 build ready for beta QA
4
129 soft Code Freeze starts at 08:00 UTC
5
Final deadline for QA’s Feature Test Plan approval
String Freeze
129 regression testing completed
6
7
8
Merge day
129 b1 GTB
Nightly 130 starts
9
128 Release
10
129 b2 GTB
11
12
129 b3 GTB
SUMO deadline
130 QA request deadline for Nightly
13
14
15
129 b4 GTB
16
17
129 b5 GTB
18
19
129 b6 GTB
130 build ready for nightly QA
20
21
22
129 b7 GTB
SUMO content localization starts
23
Planned 128.0.x
24
129 b8 GTB
129 QA sign off
25
26
129 b9 GTB
27
28
29
129 go to Build
30
RC
31
130 build ready for beta QA

August 2024
SMTWTFS
1
130 soft Code Freeze starts at 08:00 UTC
2
Final deadline for QA’s Feature Test Plan approval
String Freeze
130 regression testing completed
3
4
5
Merge day
130 b1 GTB
Nightly 131 starts
6
129 Release
7
130 b2 GTB
8
9
130 b3 GTB
SUMO deadline
131 QA request deadline for Nightly
10
11
12
130 b4 GTB
13
14
130 b5 GTB
15
16
130 b6 GTB
131 build ready for nightly QA
17
18
19
130 b7 GTB
SUMO content localization starts
20
Planned 129.0.x
21
130 b8 GTB
130 QA sign off
22
23
130 b9 GTB
24
25
26
130 go to Build
27
RC
28
131 build ready for beta QA
29
131 soft Code Freeze starts at 08:00 UTC
30
Final deadline for QA’s Feature Test Plan approval
String Freeze
131 regression testing completed
31

September 2024
SMTWTFS
1
2
Merge day
131 b1 GTB
Nightly 132 starts
3
130 Release
4
131 b2 GTB
5
6
131 b3 GTB
SUMO deadline
132 QA request deadline for Nightly
7
8
9
131 b4 GTB
10
11
131 b5 GTB
12
13
131 b6 GTB
132 build ready for nightly QA
14
15
16
131 b7 GTB
SUMO content localization starts
17
Planned 130.0.x
18
131 b8 GTB
131 QA sign off
19
20
131 b9 GTB
21
22
23
131 go to Build
24
RC
25
132 build ready for beta QA
26
132 soft Code Freeze starts at 08:00 UTC
27
Final deadline for QA’s Feature Test Plan approval
String Freeze
132 regression testing completed
28
29
30
Merge day
132 b1 GTB
Nightly 133 starts

October 2024
SMTWTFS
1
131 Release
2
132 b2 GTB
3
4
132 b3 GTB
SUMO deadline
133 QA request deadline for Nightly
5
6
7
132 b4 GTB
8
9
132 b5 GTB
10
11
132 b6 GTB
133 build ready for nightly QA
12
13
14
132 b7 GTB
SUMO content localization starts
15
Planned 131.0.x
16
132 b8 GTB
132 QA sign off
17
18
132 b9 GTB
19
20
21
132 go to Build
22
RC
23
133 build ready for beta QA
24
133 soft Code Freeze starts at 08:00 UTC
25
Final deadline for QA’s Feature Test Plan approval
String Freeze
133 regression testing completed
26
27
28
Merge day
133 b1 GTB
Nightly 134 starts
29
132 Release
30
133 b2 GTB
31

October 2024
SMTWTFS
1
131 Release
2
132 b2 GTB
3
4
132 b3 GTB
SUMO deadline
133 QA request deadline for Nightly
5
6
7
132 b4 GTB
8
9
132 b5 GTB
10
11
132 b6 GTB
133 build ready for nightly QA
12
13
14
132 b7 GTB
SUMO content localization starts
15
Planned 131.0.x
16
132 b8 GTB
132 QA sign off
17
18
132 b9 GTB
19
20
21
132 go to Build
22
RC
23
133 build ready for beta QA
24
133 soft Code Freeze starts at 08:00 UTC
25
Final deadline for QA’s Feature Test Plan approval
String Freeze
133 regression testing completed
26
27
28
Merge day
133 b1 GTB
Nightly 134 starts
29
132 Release
30
133 b2 GTB
31

November 2024
SMTWTFS
1
133 b3 GTB
SUMO deadline
134 QA request deadline for Nightly
2
3
4
133 b4 GTB
5
6
133 b5 GTB
7
8
133 b6 GTB
134 build ready for nightly QA
9
10
11
133 b7 GTB
SUMO content localization starts
12
Planned 132.0.x
13
133 b8 GTB
133 QA sign off
14
15
133 b9 GTB
16
17
18
133 go to Build
19
RC
20
134 build ready for beta QA
21
134 soft Code Freeze starts at 08:00 UTC
22
Final deadline for QA’s Feature Test Plan approval
String Freeze
134 regression testing completed
23
24
25
Merge day
134 b1 GTB
Nightly 135 starts
26
133 Release
27
134 b2 GTB
28
29
134 b3 GTB
SUMO deadline
135 QA request deadline for Nightly
30

January 2025
SMTWTFS
1
2
3
4
5
6
Merge day
135 b1 GTB
7
134 Release
8
135 b2 GTB
9
10
135 b3 GTB
SUMO deadline
11
12
13
135 b4 GTB
14
15
135 b5 GTB
16
17
135 b6 GTB
18
19
20
135 b7 GTB
SUMO content localization starts
21
Planned 134.0.x
22
135 b8 GTB
135 QA sign off
23
24
135 b9 GTB
25
26
27
135 go to Build
28
RC
29
30
31

February 2025
SMTWTFS
1
2
3
4
135 Release
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Planned 135.0.x
19
20
21
22
23
24
25
26
27
28