Mozilla Firefox Open source web browser
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Recent Mozilla Firefox Security Advisories
| Advisory | Title | Published |
|---|---|---|
| mfsa2026-49 | Security Vulnerabilities fixed in Firefox for iOS 151.0 mfsa2026-49 | May 19, 2026 |
| mfsa2026-48 | Security Vulnerabilities fixed in Firefox ESR 140.11 mfsa2026-48 | May 19, 2026 |
| mfsa2026-47 | Security Vulnerabilities fixed in Firefox ESR 115.36 mfsa2026-47 | May 19, 2026 |
| mfsa2026-46 | Security Vulnerabilities fixed in Firefox 151 mfsa2026-46 | May 19, 2026 |
| mfsa2026-45 | Security Vulnerabilities fixed in Firefox 150.0.3 mfsa2026-45 | May 12, 2026 |
| mfsa2026-42 | Security Vulnerabilities fixed in Firefox ESR 115.35.2 mfsa2026-42 | May 7, 2026 |
| mfsa2026-41 | Security Vulnerabilities fixed in Firefox ESR 140.10.2 mfsa2026-41 | May 7, 2026 |
| mfsa2026-40 | Security Vulnerabilities fixed in Firefox 150.0.2 mfsa2026-40 | May 7, 2026 |
| mfsa2026-37 | Security Vulnerabilities fixed in Firefox ESR 115.35.1 mfsa2026-37 | April 28, 2026 |
| mfsa2026-35 | Security Vulnerabilities fixed in Firefox 150.0.1 mfsa2026-35 | April 28, 2026 |
Known Exploited Mozilla Firefox Vulnerabilities
The following Mozilla Firefox vulnerabilities have been marked by CISA as Known to be Exploited by threat actors.
| Title | Description | Added |
|---|---|---|
| Mozilla Firefox Use-After-Free Vulnerability |
Mozilla Firefox and Firefox ESR contain a use-after-free vulnerability in Animation timelines that allows for code execution in the content process. CVE-2024-9680 Exploit Probability: 35.0% |
October 15, 2024 |
| Mozilla Firefox Security Feature Bypass Vulnerability |
Moxilla Firefox allows remote attackers to bypass the Same Origin Policy to read arbitrary files or gain privileges. CVE-2015-4495 Exploit Probability: 71.6% |
May 25, 2022 |
| Mozilla Firefox Use-After-Free Vulnerability |
Mozilla Firefox contains a use-after-free vulnerability in WebGPU IPC Framework which can be exploited to perform arbitrary code execution. CVE-2022-26486 Exploit Probability: 5.5% |
March 7, 2022 |
| Mozilla Firefox Use-After-Free Vulnerability |
Mozilla Firefox contains a use-after-free vulnerability in XSLT parameter processing which can be exploited to perform arbitrary code execution. CVE-2022-26485 Exploit Probability: 7.2% |
March 7, 2022 |
| Mozilla Firefox Information Disclosure Vulnerability |
Mozilla Firefox does not properly initialize data structures for the nsDOMSVGZoomEvent::mPreviousScale and nsDOMSVGZoomEvent::mNewScale functions, which allows remote attackers to obtain sensitive information from process memory via a crafted web site. CVE-2013-1675 Exploit Probability: 7.9% |
March 3, 2022 |
2 known exploited Mozilla Firefox vulnerabilities are in the top 5% (95th percentile or greater) of the EPSS exploit probability rankings.
EOL Dates
Ensure that you are using a supported version of Mozilla Firefox. Here are some end of life, and end of support dates for Mozilla Firefox.
| Release | EOL Date | Status |
|---|---|---|
| 151 | - |
Active
|
| 150 | May 18, 2026 |
EOL
Mozilla Firefox 150 became EOL in 2026. |
| 149 | April 21, 2026 |
EOL
Mozilla Firefox 149 became EOL in 2026. |
| 148 | March 24, 2026 |
EOL
Mozilla Firefox 148 became EOL in 2026. |
| 147 | February 24, 2026 |
EOL
Mozilla Firefox 147 became EOL in 2026. |
| 146 | January 13, 2026 |
EOL
Mozilla Firefox 146 became EOL in 2026. |
| 145 | December 9, 2025 |
EOL
Mozilla Firefox 145 became EOL in 2025. |
| 144 | November 11, 2025 |
EOL
Mozilla Firefox 144 became EOL in 2025. |
| 143 | October 14, 2025 |
EOL
Mozilla Firefox 143 became EOL in 2025. |
| 142 | September 16, 2025 |
EOL
Mozilla Firefox 142 became EOL in 2025. |
| 141 | August 19, 2025 |
EOL
Mozilla Firefox 141 became EOL in 2025. |
| 140 | September 16, 2026 |
EOL This Year
Mozilla Firefox 140 will become EOL this year, in September 2026. |
| 139 | June 24, 2025 |
EOL
Mozilla Firefox 139 became EOL in 2025. |
| 138 | May 27, 2025 |
EOL
Mozilla Firefox 138 became EOL in 2025. |
| 137 | April 29, 2025 |
EOL
Mozilla Firefox 137 became EOL in 2025. |
| 136 | April 1, 2025 |
EOL
Mozilla Firefox 136 became EOL in 2025. |
| 135 | March 4, 2025 |
EOL
Mozilla Firefox 135 became EOL in 2025. |
| 134 | February 4, 2025 |
EOL
Mozilla Firefox 134 became EOL in 2025. |
| 133 | January 7, 2025 |
EOL
Mozilla Firefox 133 became EOL in 2025. |
| 132 | November 26, 2024 |
EOL
Mozilla Firefox 132 became EOL in 2024. |
By the Year
In 2026 there have been 213 vulnerabilities in Mozilla Firefox with an average score of 8.2 out of ten. Last year, in 2025 Firefox had 189 security vulnerabilities published. That is, 24 more vulnerabilities have already been reported in 2026 as compared to last year. However, the average CVE base score of the vulnerabilities in 2026 is greater by 0.68.
| Year | Vulnerabilities | Average Score |
|---|---|---|
| 2026 | 213 | 8.22 |
| 2025 | 189 | 7.54 |
| 2024 | 190 | 7.15 |
| 2023 | 180 | 7.38 |
| 2022 | 159 | 7.44 |
| 2021 | 123 | 7.13 |
| 2020 | 148 | 7.27 |
| 2019 | 121 | 7.44 |
| 2018 | 312 | 7.82 |
It may take a day or so for new Firefox vulnerabilities to show up in the stats or in the list of recent security vulnerabilities. Additionally vulnerabilities may be tagged under a different product or component name.
Recent Mozilla Firefox Security Vulnerabilities
Firefox iOS 151.0 Reader Mode Local Server SSRF
CVE-2026-8706
6.5 - Medium
- May 19, 2026
Firefox for iOS hosted Reader mode on an unauthenticated local web server, allowing another application on the same device to request arbitrary URLs and receive the response rendered with the signed-in user's cookies. This vulnerability was fixed in Firefox for iOS 151.0.
Missing Authentication for Critical Function
Mozilla Firefox ESR 115.35/140.10/150 Mem Safety Bug (CVE-2026-8975)
CVE-2026-8975
8.8 - High
- May 19, 2026
Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Buffer Overflow
Firefox Memory Safety Bugs 140.10/150: Arbitrary Code Exec Fix in 151
CVE-2026-8974
8.8 - High
- May 19, 2026
Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Buffer Overflow
Mem Saf Bugs in Mozilla Firefox 150
CVE-2026-8973
8.8 - High
- May 19, 2026
Memory safety bugs present in Thunderbird 150. 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 151 and Thunderbird 151.
Buffer Overflow
Firefox WebRTC Audio/Video PE Vulnerability
CVE-2026-8972
8.8 - High
- May 19, 2026
Privilege escalation in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Improper Privilege Management
CVE-2026-8971: Same-Origin Policy Bypass in Firefox JAR Component
CVE-2026-8971
6.5 - Medium
- May 19, 2026
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Origin Validation Error
Firefox Privilege Escalation in Security Component before 151/140.11
CVE-2026-8970
8.8 - High
- May 19, 2026
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Improper Privilege Management
CVE-2026-8969: Mitigation Bypass in DOM Security Component of Firefox
CVE-2026-8969
8.1 - High
- May 19, 2026
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Protection Mechanism Failure
Firefox Web Codecs DS via invalid pointer fixed in 151/140.11
CVE-2026-8968
7.5 - High
- May 19, 2026
Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Resource Exhaustion
Info Disclosure via WebGPU in Firefox
CVE-2026-8967
7.5 - High
- May 19, 2026
Information disclosure in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Information Disclosure
Information disclosure in Mozilla Firefox IP Protection component
CVE-2026-8966
7.5 - High
- May 19, 2026
Information disclosure in the IP Protection component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Information Disclosure
Firefox DOM Info Disclosure (CVE-2026-8965) Fix/Update
CVE-2026-8965
7.5 - High
- May 19, 2026
Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Information Disclosure
Firefox Popup Blocker Spoofing Vulnerability (CVE-2026-8964)
CVE-2026-8964
7.5 - High
- May 19, 2026
Spoofing issue in the Popup Blocker component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
User Interface (UI) Misrepresentation of Critical Information
Firefox Web Speech Spoofing Vulnerability
CVE-2026-8963
7.5 - High
- May 19, 2026
Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Authentication Bypass by Spoofing
Firefox 151/ESR 140.11 DOM Mitigation Bypass Security Component
CVE-2026-8962
8.1 - High
- May 19, 2026
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Protection Mechanism Failure
Firefox Form Autofill Spoofing CVE-2026-8961 (fixed in 151/ESR 140.11)
CVE-2026-8961
6.5 - Medium
- May 19, 2026
Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Authentication Bypass by Spoofing
Firefox 151 WebExt Spoofing Vulnerability
CVE-2026-8960
7.5 - High
- May 19, 2026
Spoofing issue in WebExtensions. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Authentication Bypass by Spoofing
Firefox 151 Win32 Widget Sandbox Escape - Boundary Condition Flaw
CVE-2026-8959
9.6 - Critical
- May 19, 2026
Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Buffer Overflow
Firefox 151 Information Disclosure Process Sandbox Escape
CVE-2026-8958
8.6 - High
- May 19, 2026
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Exposure of Resource to Wrong Sphere
Privilege Escalation in Firefox Enterprise Policies (before 151)
CVE-2026-8957
8.8 - High
- May 19, 2026
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Improper Privilege Management
Integer Overflow in Firefox Networking JAR (150)
CVE-2026-8956
9.8 - Critical
- May 19, 2026
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Integer Overflow or Wraparound
Firefox Workers DOM Privilege Escalation (Pre151)
CVE-2026-8955
8.8 - High
- May 19, 2026
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Improper Privilege Management
Integer Overflow in Firefox AV Comp (before 151/ESR 140.11)
CVE-2026-8954
7.5 - High
- May 19, 2026
Incorrect boundary conditions, integer overflow in the Audio/Video component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Buffer Overflow
Firefox Sandbox Escape via Use-After-Free in Disability Access APIs (before 151)
CVE-2026-8953
9.6 - Critical
- May 19, 2026
Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Dangling pointer
Firefox PrivEsc via Application Update component CVE-2026-8952
CVE-2026-8952
8.8 - High
- May 19, 2026
Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Improper Privilege Management
Spoofing Flaw in Firefox for Android Toolbar
CVE-2026-8951
6.5 - Medium
- May 19, 2026
Spoofing issue in the Toolbar component in Firefox for Android. This vulnerability was fixed in Firefox 151.
Authentication Bypass by Spoofing
Same-origin policy bypass in Firefox Networking:HTTP component before 151
CVE-2026-8950
9.3 - Critical
- May 19, 2026
Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Origin Validation Error
Firefox 151 Integer Overflow in Widget: Win32 Component (pre-151)
CVE-2026-8949
7.5 - High
- May 19, 2026
Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Integer Overflow or Wraparound
CVE-2026-8948: Same-origin policy bypass in Firefox DOM networking
CVE-2026-8948
9.1 - Critical
- May 19, 2026
Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Permissive Cross-domain Policy with Untrusted Domains
Use-After-Free in WebIDL Bindings (Firefox <151)
CVE-2026-8947
7.3 - High
- May 19, 2026
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Dangling pointer
Firefox Web Codecs Incorrect Boundary Conditions <151 (ESR 115/140)
CVE-2026-8946
7.5 - High
- May 19, 2026
Incorrect boundary conditions in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Buffer Overflow
Firefox Sandbox Escape (Android Focus & Desktop)
CVE-2026-8945
7.5 - High
- May 19, 2026
Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.
Protection Mechanism Failure
Firefox 150.0.3 Sandbox Escape in Profile Backup (Fixed)
CVE-2026-8401
9.8 - Critical
- May 12, 2026
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Protection Mechanism Failure
JavaScript Engine flaw in Firefox 150.0.3 (fixed)
CVE-2026-8391
5.3 - Medium
- May 12, 2026
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Improper Input Validation
Firefox WebAssembly Component UAF (pre-150.0.3)
CVE-2026-8390
7.3 - High
- May 12, 2026
Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.0.3.
Dangling pointer
Firefox JIT Miscompilation in JS Engine, Fixed in 150.0.3
CVE-2026-8389
7.3 - High
- May 12, 2026
JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3.
Function Call With Incorrect Argument Type
Firefox 150 JIT Boundary Condition Vulnerability in JS Engine
CVE-2026-8388
6.5 - Medium
- May 12, 2026
Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Buffer Overflow
Firefox ESR 140.10.2 WebRTC Vulnerability
CVE-2026-8094
9.8 - Critical
- May 07, 2026
Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.
Code Injection
Firefox 150.0.1 Memcor bugs may allow arbitrary code execution
CVE-2026-8093
8.1 - High
- May 07, 2026
Memory safety bugs present in Firefox 150.0.1. 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 150.0.2 and Thunderbird 150.0.2.
Buffer Overflow
Firefox 115.35.1/140.10.1/150.0.1 Memory Safety Bug
CVE-2026-8092
8.1 - High
- May 07, 2026
Memory safety bugs present in Firefox ESR 115.35.1, Firefox ESR 140.10.1 and Firefox 150.0.1. 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 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
Out-of-bounds Read
Firefox ESR AV Playback boundary flaw before 140.10.2
CVE-2026-8091
9.8 - Critical
- May 07, 2026
Incorrect boundary conditions in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, Thunderbird 140.10.1, and Firefox ESR 115.35.2.
Improper Check for Unusual or Exceptional Conditions
Use-after-free in Firefox DOM Networking pre-150.0.2
CVE-2026-8090
7.3 - High
- May 07, 2026
Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, Firefox ESR 115.35.2, Thunderbird 150.0.2, and Thunderbird 140.10.2.
Dangling pointer
Firefox Sandbox Escape in WebRTC Networking before ESR 140.10.1
CVE-2026-7321
9.6 - Critical
- April 28, 2026
Sandbox escape due to incorrect boundary conditions in the WebRTC: Networking component. This vulnerability was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
Classic Buffer Overflow
Memory safety bugs in Firefox 150.0.0 (fixed 150.0.1)
CVE-2026-7324
7.3 - High
- April 28, 2026
Memory safety bugs present in Thunderbird 150.0.0. 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 150.0.1 and Thunderbird 150.0.1.
Buffer Overflow
Memory Safety Bug in Firefox ESR 140.10.0 & Thunderbird 140.10.0
CVE-2026-7323
7.3 - High
- April 28, 2026
Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
Buffer Overflow
Memory safety bugs in Firefox ESR 115.35.0/140.10.0 & 150.0.0 (fixed 150.0.1)
CVE-2026-7322
7.3 - High
- April 28, 2026
Memory safety bugs present in Thunderbird ESR 140.10.0 and Thunderbird 150.0.0. 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 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
Buffer Overflow
Firefox Audio/Video Boundary Bug Info Disclosure (fixed in 150.0.1)
CVE-2026-7320
7.5 - High
- April 28, 2026
Information disclosure due to incorrect boundary conditions in the Audio/Video component. This vulnerability was fixed in Firefox 150.0.1, Firefox ESR 140.10.1, Firefox ESR 115.35.1, Thunderbird 150.0.1, and Thunderbird 140.10.1.
Buffer Overflow
Firefox 149 / ESR 140.9 Memory Safety Bugs (Arbitrary Code Exec)
CVE-2026-6786
8.1 - High
- April 21, 2026
Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Dangling pointer
Mozilla Firefox Memory Safety Bug (ESR 115.34, 115.35, ESR 140.9/140.10, 149)
CVE-2026-6785
8.1 - High
- April 21, 2026
Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. 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 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
Out-of-bounds Read
Memory Safety Bugs in Firefox 149 & Thunderbird 149
CVE-2026-6784
7.5 - High
- April 21, 2026
Memory safety bugs present in Firefox 149 and Thunderbird 149. 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 150 and Thunderbird 150.
Out-of-bounds Read
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