diff --git a/.changeset/great-cows-camp.md b/.changeset/great-cows-camp.md
new file mode 100644
index 0000000000..88508ff6e0
--- /dev/null
+++ b/.changeset/great-cows-camp.md
@@ -0,0 +1,6 @@
+---
+"@rrweb/record": patch
+"rrweb": patch
+---
+
+Added support for deprecated addRule & removeRule methods
diff --git a/packages/rrweb/src/record/observer.ts b/packages/rrweb/src/record/observer.ts
index ebd5abef7e..ab1f958589 100644
--- a/packages/rrweb/src/record/observer.ts
+++ b/packages/rrweb/src/record/observer.ts
@@ -661,6 +661,17 @@ function initStyleSheetObserver(
     ),
   });
 
+  // Support for deprecated addRule method
+  win.CSSStyleSheet.prototype.addRule = function (
+    this: CSSStyleSheet,
+    selector: string,
+    styleBlock: string,
+    index: number = this.cssRules.length,
+  ) {
+    const rule = `${selector} { ${styleBlock} }`;
+    return win.CSSStyleSheet.prototype.insertRule.apply(this, [rule, index]);
+  };
+
   // eslint-disable-next-line @typescript-eslint/unbound-method
   const deleteRule = win.CSSStyleSheet.prototype.deleteRule;
   win.CSSStyleSheet.prototype.deleteRule = new Proxy(deleteRule, {
@@ -692,6 +703,14 @@ function initStyleSheetObserver(
     ),
   });
 
+  // Support for deprecated removeRule method
+  win.CSSStyleSheet.prototype.removeRule = function (
+    this: CSSStyleSheet,
+    index: number,
+  ) {
+    return win.CSSStyleSheet.prototype.deleteRule.apply(this, [index]);
+  };
+
   let replace: (text: string) => Promise<CSSStyleSheet>;
 
   if (win.CSSStyleSheet.prototype.replace) {
diff --git a/packages/rrweb/test/__snapshots__/record.test.ts.snap b/packages/rrweb/test/__snapshots__/record.test.ts.snap
index 2333d8f251..8d540c0e2d 100644
--- a/packages/rrweb/test/__snapshots__/record.test.ts.snap
+++ b/packages/rrweb/test/__snapshots__/record.test.ts.snap
@@ -2196,6 +2196,146 @@ exports[`record > captures stylesheet rules 1`] = `
 ]"
 `;
 
+exports[`record > captures stylesheet rules with deprecated addRule & removeRule properties 1`] = `
+"[
+  {
+    \\"type\\": 4,
+    \\"data\\": {
+      \\"href\\": \\"about:blank\\",
+      \\"width\\": 1920,
+      \\"height\\": 1080
+    }
+  },
+  {
+    \\"type\\": 2,
+    \\"data\\": {
+      \\"node\\": {
+        \\"type\\": 0,
+        \\"childNodes\\": [
+          {
+            \\"type\\": 1,
+            \\"name\\": \\"html\\",
+            \\"publicId\\": \\"\\",
+            \\"systemId\\": \\"\\",
+            \\"id\\": 2
+          },
+          {
+            \\"type\\": 2,
+            \\"tagName\\": \\"html\\",
+            \\"attributes\\": {},
+            \\"childNodes\\": [
+              {
+                \\"type\\": 2,
+                \\"tagName\\": \\"head\\",
+                \\"attributes\\": {},
+                \\"childNodes\\": [],
+                \\"id\\": 4
+              },
+              {
+                \\"type\\": 2,
+                \\"tagName\\": \\"body\\",
+                \\"attributes\\": {},
+                \\"childNodes\\": [
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n          \\",
+                    \\"id\\": 6
+                  },
+                  {
+                    \\"type\\": 2,
+                    \\"tagName\\": \\"input\\",
+                    \\"attributes\\": {
+                      \\"type\\": \\"text\\",
+                      \\"size\\": \\"40\\"
+                    },
+                    \\"childNodes\\": [],
+                    \\"id\\": 7
+                  },
+                  {
+                    \\"type\\": 3,
+                    \\"textContent\\": \\"\\\\n        \\\\n      \\\\n    \\",
+                    \\"id\\": 8
+                  }
+                ],
+                \\"id\\": 5
+              }
+            ],
+            \\"id\\": 3
+          }
+        ],
+        \\"id\\": 1
+      },
+      \\"initialOffset\\": {
+        \\"left\\": 0,
+        \\"top\\": 0
+      }
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 0,
+      \\"texts\\": [],
+      \\"attributes\\": [],
+      \\"removes\\": [],
+      \\"adds\\": [
+        {
+          \\"parentId\\": 4,
+          \\"nextId\\": null,
+          \\"node\\": {
+            \\"type\\": 2,
+            \\"tagName\\": \\"style\\",
+            \\"attributes\\": {
+              \\"_cssText\\": \\"body { background: rgb(0, 0, 0); }\\"
+            },
+            \\"childNodes\\": [],
+            \\"id\\": 9
+          }
+        }
+      ]
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 8,
+      \\"id\\": 9,
+      \\"adds\\": [
+        {
+          \\"rule\\": \\"body { color: #fff; }\\",
+          \\"index\\": 1
+        }
+      ]
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 8,
+      \\"id\\": 9,
+      \\"removes\\": [
+        {
+          \\"index\\": 0
+        }
+      ]
+    }
+  },
+  {
+    \\"type\\": 3,
+    \\"data\\": {
+      \\"source\\": 8,
+      \\"id\\": 9,
+      \\"adds\\": [
+        {
+          \\"rule\\": \\"body { color: #ccc; }\\",
+          \\"index\\": 1
+        }
+      ]
+    }
+  }
+]"
+`;
+
 exports[`record > captures stylesheets in iframes with \`blob:\` url 1`] = `
 "[
   {
diff --git a/packages/rrweb/test/record.test.ts b/packages/rrweb/test/record.test.ts
index 2eb3ef9da1..2c0f07adf7 100644
--- a/packages/rrweb/test/record.test.ts
+++ b/packages/rrweb/test/record.test.ts
@@ -297,6 +297,7 @@ describe('record', function (this: ISuite) {
       // begin: pre-serialization
       const ruleIdx0 = styleSheet.insertRule('body { background: #000; }');
       const ruleIdx1 = styleSheet.insertRule('body { background: #111; }');
+
       styleSheet.deleteRule(ruleIdx1);
       // end: pre-serialization
       setTimeout(() => {
@@ -328,6 +329,69 @@ describe('record', function (this: ISuite) {
         rule: 'body { color: #fff; }',
       },
     ]);
+    expect((addRules[1].data as styleSheetRuleData).adds).toEqual([
+      {
+        rule: 'body { color: #ccc; }',
+      },
+    ]);
+    expect(removeRuleCount).toEqual(1);
+    await assertSnapshot(ctx.events);
+  });
+
+  it('captures stylesheet rules with deprecated addRule & removeRule properties', async () => {
+    await ctx.page.evaluate(() => {
+      const { record } = (window as unknown as IWindow).rrweb;
+
+      record({
+        emit: (window as unknown as IWindow).emit,
+      });
+
+      const styleElement = document.createElement('style');
+      document.head.appendChild(styleElement);
+
+      const styleSheet = <CSSStyleSheet>styleElement.sheet;
+      // begin: pre-serialization
+      const ruleIdx0 = styleSheet.addRule('body', 'background: #000;');
+      const ruleIdx1 = styleSheet.addRule('body', 'background: #111;');
+
+      styleSheet.removeRule(ruleIdx1);
+      // end: pre-serialization
+      setTimeout(() => {
+        styleSheet.addRule('body', 'color: #fff;');
+      }, 0);
+      setTimeout(() => {
+        styleSheet.removeRule(ruleIdx0);
+      }, 5);
+      setTimeout(() => {
+        styleSheet.addRule('body', 'color: #ccc;');
+      }, 10);
+    });
+    await ctx.page.waitForTimeout(50);
+    const styleSheetRuleEvents = ctx.events.filter(
+      (e) =>
+        e.type === EventType.IncrementalSnapshot &&
+        e.data.source === IncrementalSource.StyleSheetRule,
+    );
+    const addRules = styleSheetRuleEvents.filter((e) =>
+      Boolean((e.data as styleSheetRuleData).adds),
+    );
+    const removeRuleCount = styleSheetRuleEvents.filter((e) =>
+      Boolean((e.data as styleSheetRuleData).removes),
+    ).length;
+    // pre-serialization insert/delete should be ignored
+    expect(addRules.length).toEqual(2);
+    expect((addRules[0].data as styleSheetRuleData).adds).toEqual([
+      {
+        index: 1,
+        rule: 'body { color: #fff; }',
+      },
+    ]);
+    expect((addRules[1].data as styleSheetRuleData).adds).toEqual([
+      {
+        index: 1,
+        rule: 'body { color: #ccc; }',
+      },
+    ]);
     expect(removeRuleCount).toEqual(1);
     await assertSnapshot(ctx.events);
   });