Firefox 139
Firefox 139 reached end of life 16 months ago.
Supported now: Firefox 115 (LTS until 2027-03-31), Firefox 153 (no announced date), Firefox 158 (until 2026-10-27)
Facts
- Released
- (16 months ago)
- Security support ended
- (16 months ago)
- Latest release
- 139.0.4, (16 months ago)
- Source
- endoflife.date (checked 2026-09-09)
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