CVE-2025-1020
Memory safety bugs fixed in Firefox 135 and Thunderbird 135
CVE-2025-1020 is fixed in 212 products on 2 platforms, first by Firefox Developer Edition (ach) 135.0, released January 24, 2025. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
9.8
Medium
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0054
45th percentile
Memory safety bugs present in Firefox 134 and Thunderbird 134. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 135 and Thunderbird 135.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Firefox Developer Edition (ach) | 135.0 | Firefox Developer Edition (ach) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (af) | 135.0 | Firefox Developer Edition (af) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (an) | 135.0 | Firefox Developer Edition (an) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ar) | 135.0 | Firefox Developer Edition (ar) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ast) | 135.0 | Firefox Developer Edition (ast) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (az) | 135.0 | Firefox Developer Edition (az) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (be) | 135.0 | Firefox Developer Edition (be) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (bg) | 135.0 | Firefox Developer Edition (bg) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (bn) | 135.0 | Firefox Developer Edition (bn) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (br) | 135.0 | Firefox Developer Edition (br) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (bs) | 135.0 | Firefox Developer Edition (bs) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ca) | 135.0 | Firefox Developer Edition (ca) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ca-valencia) | 135.0 | Firefox Developer Edition (ca-valencia) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (cak) | 135.0 | Firefox Developer Edition (cak) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (cs) | 135.0 | Firefox Developer Edition (cs) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (cy) | 135.0 | Firefox Developer Edition (cy) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (da) | 135.0 | Firefox Developer Edition (da) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (de) | 135.0 | Firefox Developer Edition (de) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (dsb) | 135.0 | Firefox Developer Edition (dsb) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (el) | 135.0 | Firefox Developer Edition (el) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (en-CA) | 135.0 | Firefox Developer Edition (en-CA) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (en-GB) | 135.0 | Firefox Developer Edition (en-GB) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (en-US) | 135.0 | Firefox Developer Edition (en-US) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (eo) | 135.0 | Firefox Developer Edition (eo) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (es-AR) | 135.0 | Firefox Developer Edition (es-AR) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (es-CL) | 135.0 | Firefox Developer Edition (es-CL) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (es-ES) | 135.0 | Firefox Developer Edition (es-ES) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (es-MX) | 135.0 | Firefox Developer Edition (es-MX) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (et) | 135.0 | Firefox Developer Edition (et) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (eu) | 135.0 | Firefox Developer Edition (eu) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (fa) | 135.0 | Firefox Developer Edition (fa) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ff) | 135.0 | Firefox Developer Edition (ff) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (fi) | 135.0 | Firefox Developer Edition (fi) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (fr) | 135.0 | Firefox Developer Edition (fr) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (fur) | 135.0 | Firefox Developer Edition (fur) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (fy-NL) | 135.0 | Firefox Developer Edition (fy-NL) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ga-IE) | 135.0 | Firefox Developer Edition (ga-IE) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (gd) | 135.0 | Firefox Developer Edition (gd) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (gl) | 135.0 | Firefox Developer Edition (gl) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (gn) | 135.0 | Firefox Developer Edition (gn) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (gu-IN) | 135.0 | Firefox Developer Edition (gu-IN) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (he) | 135.0 | Firefox Developer Edition (he) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (hi-IN) | 135.0 | Firefox Developer Edition (hi-IN) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (hr) | 135.0 | Firefox Developer Edition (hr) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (hsb) | 135.0 | Firefox Developer Edition (hsb) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (hu) | 135.0 | Firefox Developer Edition (hu) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (hy-AM) | 135.0 | Firefox Developer Edition (hy-AM) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ia) | 135.0 | Firefox Developer Edition (ia) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (id) | 135.0 | Firefox Developer Edition (id) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (is) | 135.0 | Firefox Developer Edition (is) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (it) | 135.0 | Firefox Developer Edition (it) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ja) | 135.0 | Firefox Developer Edition (ja) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ka) | 135.0 | Firefox Developer Edition (ka) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (kab) | 135.0 | Firefox Developer Edition (kab) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (kk) | 135.0 | Firefox Developer Edition (kk) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (km) | 135.0 | Firefox Developer Edition (km) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (kn) | 135.0 | Firefox Developer Edition (kn) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ko) | 135.0 | Firefox Developer Edition (ko) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (lij) | 135.0 | Firefox Developer Edition (lij) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (lt) | 135.0 | Firefox Developer Edition (lt) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (lv) | 135.0 | Firefox Developer Edition (lv) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (mk) | 135.0 | Firefox Developer Edition (mk) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (mr) | 135.0 | Firefox Developer Edition (mr) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ms) | 135.0 | Firefox Developer Edition (ms) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (my) | 135.0 | Firefox Developer Edition (my) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (nb-NO) | 135.0 | Firefox Developer Edition (nb-NO) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ne-NP) | 135.0 | Firefox Developer Edition (ne-NP) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (nl) | 135.0 | Firefox Developer Edition (nl) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (nn-NO) | 135.0 | Firefox Developer Edition (nn-NO) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (oc) | 135.0 | Firefox Developer Edition (oc) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (pa-IN) | 135.0 | Firefox Developer Edition (pa-IN) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (pl) | 135.0 | Firefox Developer Edition (pl) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (pt-BR) | 135.0 | Firefox Developer Edition (pt-BR) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (pt-PT) | 135.0 | Firefox Developer Edition (pt-PT) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (rm) | 135.0 | Firefox Developer Edition (rm) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ro) | 135.0 | Firefox Developer Edition (ro) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ru) | 135.0 | Firefox Developer Edition (ru) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sc) | 135.0 | Firefox Developer Edition (sc) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sco) | 135.0 | Firefox Developer Edition (sco) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (si) | 135.0 | Firefox Developer Edition (si) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sk) | 135.0 | Firefox Developer Edition (sk) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sl) | 135.0 | Firefox Developer Edition (sl) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sq) | 135.0 | Firefox Developer Edition (sq) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sr) | 135.0 | Firefox Developer Edition (sr) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (sv-SE) | 135.0 | Firefox Developer Edition (sv-SE) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (szl) | 135.0 | Firefox Developer Edition (szl) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ta) | 135.0 | Firefox Developer Edition (ta) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (te) | 135.0 | Firefox Developer Edition (te) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (tg) | 135.0 | Firefox Developer Edition (tg) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (th) | 135.0 | Firefox Developer Edition (th) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (tl) | 135.0 | Firefox Developer Edition (tl) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (tr) | 135.0 | Firefox Developer Edition (tr) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (trs) | 135.0 | Firefox Developer Edition (trs) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (uk) | 135.0 | Firefox Developer Edition (uk) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (ur) | 135.0 | Firefox Developer Edition (ur) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (uz) | 135.0 | Firefox Developer Edition (uz) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (vi) | 135.0 | Firefox Developer Edition (vi) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (xh) | 135.0 | Firefox Developer Edition (xh) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (zh-CN) | 135.0 | Firefox Developer Edition (zh-CN) 135.0 | Jan 24, 2025 |
| Firefox Developer Edition (zh-TW) | 135.0 | Firefox Developer Edition (zh-TW) 135.0 | Jan 24, 2025 |
| Mozilla Firefox (en-US) | 135.0 | Mozilla Firefox (en-US) 135.0 | Feb 6, 2025 |
| Mozilla Firefox ESR (ach) | 140.3.0 | Mozilla Firefox ESR (ach) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (af) | 140.3.0 | Mozilla Firefox ESR (af) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (an) | 140.3.0 | Mozilla Firefox ESR (an) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ar) | 140.3.0 | Mozilla Firefox ESR (ar) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ast) | 140.3.0 | Mozilla Firefox ESR (ast) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (az) | 140.3.0 | Mozilla Firefox ESR (az) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (be) | 140.3.0 | Mozilla Firefox ESR (be) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (bg) | 140.3.0 | Mozilla Firefox ESR (bg) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (bn) | 140.3.0 | Mozilla Firefox ESR (bn) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (br) | 140.3.0 | Mozilla Firefox ESR (br) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (bs) | 140.3.0 | Mozilla Firefox ESR (bs) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ca) | 140.3.0 | Mozilla Firefox ESR (ca) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ca-valencia) | 140.3.0 | Mozilla Firefox ESR (ca-valencia) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (cak) | 140.3.0 | Mozilla Firefox ESR (cak) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (cs) | 140.3.0 | Mozilla Firefox ESR (cs) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (cy) | 140.3.0 | Mozilla Firefox ESR (cy) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (da) | 140.3.0 | Mozilla Firefox ESR (da) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (de) | 140.3.0 | Mozilla Firefox ESR (de) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (dsb) | 140.3.0 | Mozilla Firefox ESR (dsb) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (el) | 140.3.0 | Mozilla Firefox ESR (el) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (en-CA) | 140.3.0 | Mozilla Firefox ESR (en-CA) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (en-GB) | 140.3.0 | Mozilla Firefox ESR (en-GB) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (en-US) | 140.3.0 | Mozilla Firefox ESR (en-US) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (eo) | 140.3.0 | Mozilla Firefox ESR (eo) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-AR) | 140.3.0 | Mozilla Firefox ESR (es-AR) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-CL) | 140.3.0 | Mozilla Firefox ESR (es-CL) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-ES) | 140.3.0 | Mozilla Firefox ESR (es-ES) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (es-MX) | 140.3.0 | Mozilla Firefox ESR (es-MX) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (et) | 140.3.0 | Mozilla Firefox ESR (et) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (eu) | 140.3.0 | Mozilla Firefox ESR (eu) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fa) | 140.3.0 | Mozilla Firefox ESR (fa) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ff) | 140.3.0 | Mozilla Firefox ESR (ff) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fi) | 140.3.0 | Mozilla Firefox ESR (fi) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fr) | 140.3.0 | Mozilla Firefox ESR (fr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fur) | 140.3.0 | Mozilla Firefox ESR (fur) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (fy-NL) | 140.3.0 | Mozilla Firefox ESR (fy-NL) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ga-IE) | 140.3.0 | Mozilla Firefox ESR (ga-IE) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gd) | 140.3.0 | Mozilla Firefox ESR (gd) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gl) | 140.3.0 | Mozilla Firefox ESR (gl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gn) | 140.3.0 | Mozilla Firefox ESR (gn) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (gu-IN) | 140.3.0 | Mozilla Firefox ESR (gu-IN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (he) | 140.3.0 | Mozilla Firefox ESR (he) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hi-IN) | 140.3.0 | Mozilla Firefox ESR (hi-IN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hr) | 140.3.0 | Mozilla Firefox ESR (hr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hsb) | 140.3.0 | Mozilla Firefox ESR (hsb) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hu) | 140.3.0 | Mozilla Firefox ESR (hu) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (hy-AM) | 140.3.0 | Mozilla Firefox ESR (hy-AM) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ia) | 140.3.0 | Mozilla Firefox ESR (ia) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (id) | 140.3.0 | Mozilla Firefox ESR (id) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (is) | 140.3.0 | Mozilla Firefox ESR (is) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (it) | 140.3.0 | Mozilla Firefox ESR (it) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ja) | 140.3.0 | Mozilla Firefox ESR (ja) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ka) | 140.3.0 | Mozilla Firefox ESR (ka) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (kab) | 140.3.0 | Mozilla Firefox ESR (kab) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (kk) | 140.3.0 | Mozilla Firefox ESR (kk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (km) | 140.3.0 | Mozilla Firefox ESR (km) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (kn) | 140.3.0 | Mozilla Firefox ESR (kn) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ko) | 140.3.0 | Mozilla Firefox ESR (ko) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (lij) | 140.3.0 | Mozilla Firefox ESR (lij) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (lt) | 140.3.0 | Mozilla Firefox ESR (lt) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (lv) | 140.3.0 | Mozilla Firefox ESR (lv) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (mk) | 140.3.0 | Mozilla Firefox ESR (mk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (mr) | 140.3.0 | Mozilla Firefox ESR (mr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ms) | 140.3.0 | Mozilla Firefox ESR (ms) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (my) | 140.3.0 | Mozilla Firefox ESR (my) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (nb-NO) | 140.3.0 | Mozilla Firefox ESR (nb-NO) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ne-NP) | 140.3.0 | Mozilla Firefox ESR (ne-NP) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (nl) | 140.3.0 | Mozilla Firefox ESR (nl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (nn-NO) | 140.3.0 | Mozilla Firefox ESR (nn-NO) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (oc) | 140.3.0 | Mozilla Firefox ESR (oc) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pa-IN) | 140.3.0 | Mozilla Firefox ESR (pa-IN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pl) | 140.3.0 | Mozilla Firefox ESR (pl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pt-BR) | 140.3.0 | Mozilla Firefox ESR (pt-BR) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (pt-PT) | 140.3.0 | Mozilla Firefox ESR (pt-PT) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (rm) | 140.3.0 | Mozilla Firefox ESR (rm) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ro) | 140.3.0 | Mozilla Firefox ESR (ro) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ru) | 140.3.0 | Mozilla Firefox ESR (ru) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sat) | 140.13.0 | Mozilla Firefox ESR (sat) 140.13.0 | Jul 20, 2026 |
| Mozilla Firefox ESR (sc) | 140.3.0 | Mozilla Firefox ESR (sc) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sco) | 140.3.0 | Mozilla Firefox ESR (sco) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (si) | 140.3.0 | Mozilla Firefox ESR (si) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sk) | 140.3.0 | Mozilla Firefox ESR (sk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sl) | 140.3.0 | Mozilla Firefox ESR (sl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (son) | 140.3.0 | Mozilla Firefox ESR (son) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sq) | 140.3.0 | Mozilla Firefox ESR (sq) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sr) | 140.3.0 | Mozilla Firefox ESR (sr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (sv-SE) | 140.3.0 | Mozilla Firefox ESR (sv-SE) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (szl) | 140.3.0 | Mozilla Firefox ESR (szl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ta) | 140.3.0 | Mozilla Firefox ESR (ta) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (te) | 140.3.0 | Mozilla Firefox ESR (te) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (tg) | 140.3.0 | Mozilla Firefox ESR (tg) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (th) | 140.3.0 | Mozilla Firefox ESR (th) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (tl) | 140.3.0 | Mozilla Firefox ESR (tl) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (tr) | 140.3.0 | Mozilla Firefox ESR (tr) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (trs) | 140.3.0 | Mozilla Firefox ESR (trs) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (uk) | 140.3.0 | Mozilla Firefox ESR (uk) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (ur) | 140.3.0 | Mozilla Firefox ESR (ur) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (uz) | 140.3.0 | Mozilla Firefox ESR (uz) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (vi) | 140.3.0 | Mozilla Firefox ESR (vi) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (xh) | 140.3.0 | Mozilla Firefox ESR (xh) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (zh-CN) | 140.3.0 | Mozilla Firefox ESR (zh-CN) 140.3.0 | Sep 16, 2025 |
| Mozilla Firefox ESR (zh-TW) | 140.3.0 | Mozilla Firefox ESR (zh-TW) 140.3.0 | Sep 16, 2025 |
| Linux | |||
| firefox · Ubuntu 20.04 LTS (focal) | 135.0+build2-0ubuntu0.20.04.1 | firefox 135.0+build2-0ubuntu0.20.04.1 | Feb 5, 2025 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 135.0+build2-0ubuntu0.20.04.1 | firefox-geckodriver 135.0+build2-0ubuntu0.20.04.1 | Feb 5, 2025 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 135.0+build2-0ubuntu0.20.04.1 | firefox-mozsymbols 135.0+build2-0ubuntu0.20.04.1 | Feb 5, 2025 |
| thunderbird · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | thunderbird 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| thunderbird-gnome-support · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | thunderbird-gnome-support 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| thunderbird-mozsymbols · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | thunderbird-mozsymbols 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| xul-ext-calendar-timezones · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | xul-ext-calendar-timezones 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| xul-ext-gdata-provider · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | xul-ext-gdata-provider 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
| xul-ext-lightning · Ubuntu 22.04.1 LTS (jammy) | 1:140.7.1+build1-0ubuntu0.22.04.1 | xul-ext-lightning 1:140.7.1+build1-0ubuntu0.22.04.1 | Jan 28, 2026 |
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