diff --git a/cli/CHANGELOG.md b/cli/CHANGELOG.md
index 2c0b4ea29fe1..31429c5272d3 100644
--- a/cli/CHANGELOG.md
+++ b/cli/CHANGELOG.md
@@ -1,7 +1,11 @@
 <!-- See the ../guides/writing-the-cypress-changelog.md for details on writing the changelog. -->
 ## 13.14.3
 
-_Released 9/10/2024 (PENDING)_
+_Released 9/24/2024 (PENDING)_
+
+**Bugfixes:**
+
+- Fixed an issue where Firefox was incorrectly mutating the state of click events on checkboxes after Firefox version `129` and up. Addressed in [#30245](/~https://github.com/cypress-io/cypress/pull/30245).
 
 **Dependency Updates:**
 
diff --git a/packages/driver/src/cy/commands/actions/type.ts b/packages/driver/src/cy/commands/actions/type.ts
index 8c4c5b1f1643..1c1b37f1bb65 100644
--- a/packages/driver/src/cy/commands/actions/type.ts
+++ b/packages/driver/src/cy/commands/actions/type.ts
@@ -192,7 +192,7 @@ export default function (Commands, Cypress, cy, state, config) {
       const isFirefoxBefore91 = Cypress.isBrowser('firefox') && Cypress.browserMajorVersion() < 91
       const isFirefoxBefore98 = Cypress.isBrowser('firefox') && Cypress.browserMajorVersion() < 98
       const isFirefox106OrLater = Cypress.isBrowser('firefox') && Cypress.browserMajorVersion() >= 106
-      const isFirefox130OrLater = Cypress.isBrowser('firefox') && Cypress.browserMajorVersion() >= 130
+      const isFirefox129OrLater = Cypress.isBrowser('firefox') && Cypress.browserMajorVersion() >= 129
 
       const simulateSubmitHandler = function () {
         const form = options.$el.parents('form')
@@ -386,10 +386,9 @@ export default function (Commands, Cypress, cy, state, config) {
 
             keydownEvents = []
 
-            // After Firefox 98 and before 130
+            // After Firefox 98 and before 129
             // Firefox doesn't update checkbox automatically even if the click event is sent.
-            // TODO: verify firefox version this starts happening
-            if (Cypress.isBrowser('firefox') && !isFirefox130OrLater) {
+            if (Cypress.isBrowser('firefox') && !isFirefox129OrLater) {
               if (event.target.type === 'checkbox') {
                 event.target.checked = !event.target.checked
               } else if (event.target.type === 'radio') { // when checked is false, here cannot be reached because of the above condition
diff --git a/packages/server/lib/browsers/firefox.ts b/packages/server/lib/browsers/firefox.ts
index 8d78cf89da4b..0d4fec848f48 100644
--- a/packages/server/lib/browsers/firefox.ts
+++ b/packages/server/lib/browsers/firefox.ts
@@ -415,6 +415,8 @@ export async function open (browser: Browser, url: string, options: BrowserLaunc
       '-marionette',
       '-new-instance',
       '-foreground',
+      // if testing against older versions of Firefox to determine when a regression may have been introduced, uncomment the '-allow-downgrade' flag.
+      // '-allow-downgrade',
       '-start-debugger-server', // uses the port+host defined in devtools.debugger.remote
       '-no-remote', // @see /~https://github.com/cypress-io/cypress/issues/6380
     ],