build(webpack): Add verbose, debug modes for React Compiler Webpack loader #38119

MajorLift · 2025-11-21T12:53:40Z

Description

Changelog

CHANGELOG entry:

Related issues

Fixes:

Manual testing steps

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Screenshots/Recordings

Before

After

Pre-merge author checklist

I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
I've completed the PR template to the best of my ability
I’ve included tests if applicable
I’ve documented my code using JSDoc format if applicable
I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

github-actions · 2025-11-21T12:53:50Z

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

MajorLift · 2025-11-21T13:02:03Z

@metamaskbot update-policies

metamaskbot · 2025-11-21T13:21:11Z

No policy changes

metamaskbot · 2025-11-21T13:34:54Z

Builds ready [3f87f45]

builds: chrome, firefox
builds (beta): chrome, firefox
builds (flask): chrome, firefox
builds (test): chrome, firefox
builds (test-flask): chrome, firefox
bundle size: Bundle Size Stats
user-actions-benchmark: User Actions Stats
storybook: Storybook
typescript migration: Dashboard
all artifacts
bundle viz:
- background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
- common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
- ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
- content-script: 0
- offscreen: 0

UI Startup Metrics (1226 ± 94 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Standard Home	uiStartup	1226	1075	1435	94	1294	1422
			load	1052	924	1255	85	1107	1208
			domContentLoaded	1046	921	1249	84	1101	1203
			domInteractive	24	14	99	16	21	61
			firstPaint	462	87	1213	395	980	1197
			backgroundConnect	212	198	251	8	216	228
			firstReactRender	30	20	69	10	38	49
			getState	33	18	71	11	39	53
			initialActions	1	0	5	1	1	3
			loadScripts	839	710	1052	84	892	992
			setupStore	11	5	26	4	12	19
			numNetworkReqs	12	5	77	20	5	72
	Browserify	Power User Home	uiStartup	1909	1589	3222	273	2088	2436
			load	1027	883	2072	181	1048	1493
			domContentLoaded	1012	876	2026	177	1024	1482
			domInteractive	35	17	182	37	29	152
			firstPaint	544	82	2076	430	952	1413
			backgroundConnect	230	205	271	14	237	260
			firstReactRender	76	42	102	12	84	93
			getState	182	131	351	45	195	294
			initialActions	1	0	5	1	1	2
			loadScripts	800	678	1801	175	809	1254
			setupStore	20	7	65	10	27	37
			numNetworkReqs	149	71	291	49	190	233
	Webpack	Standard Home	uiStartup	809	717	1018	70	834	961
			load	616	561	810	59	624	781
			domContentLoaded	612	556	803	58	620	775
			domInteractive	23	13	77	16	21	71
			firstPaint	242	77	807	176	220	635
			backgroundConnect	11	6	33	7	12	28
			firstReactRender	30	21	100	11	33	39
			getState	30	13	78	11	37	46
			initialActions	1	0	6	1	1	2
			loadScripts	609	554	794	56	618	766
			setupStore	12	5	33	5	14	22
			numNetworkReqs	12	5	77	20	5	73
	Webpack	Power User Home	uiStartup	1418	1060	2246	237	1578	1868
			load	670	584	1091	116	686	978
			domContentLoaded	660	575	1073	114	671	965
			domInteractive	35	17	183	35	27	130
			firstPaint	308	100	986	227	370	946
			backgroundConnect	15	7	41	7	19	31
			firstReactRender	80	51	111	12	88	100
			getState	150	71	265	38	167	251
			initialActions	1	0	2	0	1	2
			loadScripts	657	573	1071	112	669	956
			setupStore	22	9	81	14	31	55
			numNetworkReqs	96	69	202	34	104	194
Firefox	Browserify	Standard Home	uiStartup	1286	1129	1602	116	1352	1523
			load	1088	965	1305	80	1148	1240
			domContentLoaded	1087	964	1305	81	1147	1240
			domInteractive	65	32	231	38	87	138
			firstPaint	-	-	-	-	-	-
			backgroundConnect	39	24	129	19	43	85
			firstReactRender	23	18	52	5	23	38
			getState	11	6	91	11	10	24
			initialActions	1	0	3	0	1	2
			loadScripts	1064	948	1284	77	1115	1214
			setupStore	10	6	65	8	9	22
			numNetworkReqs	12	5	69	17	6	64
	Browserify	Power User Home	uiStartup	2722	2032	3770	369	2894	3585
			load	1190	967	1730	166	1210	1550
			domContentLoaded	1190	967	1730	167	1210	1549
			domInteractive	144	32	605	126	161	464
			firstPaint	-	-	-	-	-	-
			backgroundConnect	237	30	1082	271	240	886
			firstReactRender	83	37	174	20	92	114
			getState	248	76	890	241	204	833
			initialActions	3	0	39	5	3	7
			loadScripts	1146	944	1706	159	1156	1483
			setupStore	140	7	815	198	138	768
			numNetworkReqs	97	56	227	42	96	219
	Webpack	Standard Home	uiStartup	1408	1255	1794	127	1450	1706
			load	1207	1074	1452	94	1262	1418
			domContentLoaded	1207	1074	1452	94	1261	1418
			domInteractive	52	26	152	32	71	131
			firstPaint	-	-	-	-	-	-
			backgroundConnect	40	17	111	20	41	90
			firstReactRender	26	19	64	6	26	38
			getState	11	6	131	13	10	17
			initialActions	1	0	3	1	1	2
			loadScripts	1183	1051	1418	87	1236	1372
			setupStore	12	5	92	14	9	44
			numNetworkReqs	12	5	67	16	6	62
	Webpack	Power User Home	uiStartup	2747	1999	3745	304	2893	3413
			load	1377	1117	1911	184	1481	1810
			domContentLoaded	1377	1117	1910	184	1480	1810
			domInteractive	138	31	664	137	151	525
			firstPaint	-	-	-	-	-	-
			backgroundConnect	149	29	919	156	172	557
			firstReactRender	82	37	161	22	94	120
			getState	304	75	855	280	539	809
			initialActions	4	0	49	7	3	7
			loadScripts	1342	1094	1863	175	1417	1767
			setupStore	120	8	802	192	87	726
			numNetworkReqs	97	59	224	44	98	213

📊 Page Load Benchmark Results

Current Commit: 3f87f45 | Date: 11/21/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

pageLoadTime-> current mean value: 1.06s (±66ms) 🟡 | historical mean value: 1.04s ⬆️ (historical data)
domContentLoaded-> current mean value: 739ms (±63ms) 🟢 | historical mean value: 727ms ⬆️ (historical data)
firstContentfulPaint-> current mean value: 79ms (±11ms) 🟢 | historical mean value: 79ms ⬆️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.06s	66ms	1.02s	1.37s	1.27s	1.37s
domContentLoaded	739ms	63ms	707ms	1.02s	943ms	1.02s
firstPaint	79ms	11ms	64ms	176ms	88ms	176ms
firstContentfulPaint	79ms	11ms	64ms	176ms	88ms	176ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

metamaskbot · 2025-11-21T20:17:29Z

Builds ready [aaabb13]

builds: chrome, firefox
builds (beta): chrome, firefox
builds (flask): chrome, firefox
builds (test): chrome, firefox
builds (test-flask): chrome, firefox
bundle size: Bundle Size Stats
user-actions-benchmark: User Actions Stats
storybook: Storybook
typescript migration: Dashboard
all artifacts
bundle viz:
- background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
- common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
- ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
- content-script: 0
- offscreen: 0

UI Startup Metrics (1188 ± 99 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Standard Home	uiStartup	1188	1034	1529	99	1234	1390
			load	1024	899	1228	84	1076	1188
			domContentLoaded	1018	896	1222	83	1070	1181
			domInteractive	23	14	81	16	20	72
			firstPaint	525	76	1244	415	1022	1195
			backgroundConnect	208	197	265	9	210	227
			firstReactRender	28	18	54	8	32	43
			getState	31	18	59	9	34	51
			initialActions	1	0	8	1	1	3
			loadScripts	816	695	1016	83	866	977
			setupStore	11	6	26	4	11	19
			numNetworkReqs	12	5	78	21	5	74
	Browserify	Power User Home	uiStartup	1885	1529	2558	251	2053	2443
			load	1000	871	1637	162	1032	1464
			domContentLoaded	985	863	1589	159	1006	1453
			domInteractive	34	17	174	36	29	152
			firstPaint	557	105	1637	403	913	1415
			backgroundConnect	221	195	266	12	227	244
			firstReactRender	77	48	139	16	85	109
			getState	182	132	359	49	198	315
			initialActions	1	0	4	1	1	2
			loadScripts	780	659	1378	156	800	1236
			setupStore	20	9	68	10	28	36
			numNetworkReqs	153	71	288	54	195	263
	Webpack	Standard Home	uiStartup	853	757	1287	91	869	1060
			load	642	574	1023	71	649	820
			domContentLoaded	637	571	1014	70	644	807
			domInteractive	26	16	103	17	23	72
			firstPaint	224	104	814	144	215	621
			backgroundConnect	12	6	42	8	11	31
			firstReactRender	32	22	103	9	35	41
			getState	32	14	74	12	40	49
			initialActions	1	0	5	1	1	2
			loadScripts	634	569	1004	68	641	797
			setupStore	13	7	32	5	15	24
			numNetworkReqs	12	5	75	19	5	69
	Webpack	Power User Home	uiStartup	1455	1190	2400	237	1626	1962
			load	680	581	1300	128	689	1032
			domContentLoaded	669	576	1293	127	669	1014
			domInteractive	37	17	231	41	28	162
			firstPaint	256	88	948	168	268	654
			backgroundConnect	15	7	36	7	19	30
			firstReactRender	79	51	111	11	87	95
			getState	161	126	286	36	172	242
			initialActions	1	0	3	0	1	2
			loadScripts	666	574	1278	124	667	1003
			setupStore	24	8	78	15	34	59
			numNetworkReqs	159	70	315	57	204	256
Firefox	Browserify	Standard Home	uiStartup	1194	1051	1592	103	1237	1428
			load	1018	919	1187	67	1065	1159
			domContentLoaded	1017	919	1187	67	1065	1155
			domInteractive	52	30	162	29	58	126
			firstPaint	-	-	-	-	-	-
			backgroundConnect	36	17	143	21	39	96
			firstReactRender	22	17	49	6	21	41
			getState	10	5	79	8	9	19
			initialActions	1	0	3	1	1	2
			loadScripts	996	905	1144	63	1045	1116
			setupStore	10	6	79	9	8	24
			numNetworkReqs	11	5	69	16	7	60
	Browserify	Power User Home	uiStartup	2552	1874	3705	350	2707	3390
			load	1159	971	1548	153	1201	1511
			domContentLoaded	1158	971	1548	153	1195	1511
			domInteractive	134	34	480	113	151	451
			firstPaint	-	-	-	-	-	-
			backgroundConnect	184	24	1088	218	194	695
			firstReactRender	81	44	151	19	90	117
			getState	226	55	912	236	180	856
			initialActions	2	1	8	1	3	6
			loadScripts	1120	951	1506	143	1130	1459
			setupStore	147	5	808	208	123	692
			numNetworkReqs	97	61	220	40	97	207
	Webpack	Standard Home	uiStartup	1494	1320	1924	126	1538	1795
			load	1281	1120	1535	90	1342	1452
			domContentLoaded	1280	1119	1535	90	1342	1452
			domInteractive	76	30	219	37	98	134
			firstPaint	-	-	-	-	-	-
			backgroundConnect	43	21	254	30	43	113
			firstReactRender	28	20	72	8	30	39
			getState	12	6	153	15	11	19
			initialActions	1	0	2	1	2	2
			loadScripts	1254	1104	1465	82	1316	1404
			setupStore	12	6	53	8	11	34
			numNetworkReqs	12	5	69	17	6	64
	Webpack	Power User Home	uiStartup	2964	2211	4120	372	3129	3809
			load	1507	1207	2073	214	1658	1991
			domContentLoaded	1507	1207	2073	214	1657	1991
			domInteractive	162	34	777	155	187	577
			firstPaint	-	-	-	-	-	-
			backgroundConnect	223	30	1108	246	272	802
			firstReactRender	82	41	123	16	92	111
			getState	282	82	868	268	287	802
			initialActions	4	0	56	8	3	7
			loadScripts	1469	1189	2030	205	1619	1923
			setupStore	94	10	748	132	106	449
			numNetworkReqs	97	59	231	42	97	204

📊 Page Load Benchmark Results

Current Commit: aaabb13 | Date: 11/21/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

pageLoadTime-> current mean value: 1.03s (±40ms) 🟡 | historical mean value: 1.05s ⬇️ (historical data)
domContentLoaded-> current mean value: 717ms (±36ms) 🟢 | historical mean value: 731ms ⬇️ (historical data)
firstContentfulPaint-> current mean value: 76ms (±12ms) 🟢 | historical mean value: 80ms ⬇️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.03s	40ms	1.01s	1.33s	1.07s	1.33s
domContentLoaded	717ms	36ms	698ms	991ms	746ms	991ms
firstPaint	76ms	12ms	56ms	176ms	84ms	176ms
firstContentfulPaint	76ms	12ms	56ms	176ms	84ms	176ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

metamaskbot · 2025-11-21T21:24:41Z

Builds ready [68e28d9]

builds: chrome, firefox
builds (beta): chrome, firefox
builds (flask): chrome, firefox
builds (test): chrome, firefox
builds (test-flask): chrome, firefox
bundle size: Bundle Size Stats
user-actions-benchmark: User Actions Stats
storybook: Storybook
typescript migration: Dashboard
all artifacts
bundle viz:
- background: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
- common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
- ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
- content-script: 0
- offscreen: 0

UI Startup Metrics (1209 ± 105 ms)

Platform	BuildType	Page	Metric	Mean (ms)	Min (ms)	Max (ms)	Std Dev (ms)	P 75 (ms)	P 95 (ms)
Chrome	Browserify	Standard Home	uiStartup	1209	1002	1470	105	1270	1400
			load	1046	872	1245	99	1116	1214
			domContentLoaded	1039	859	1235	97	1107	1196
			domInteractive	21	13	72	13	19	60
			firstPaint	671	91	1242	422	1072	1172
			backgroundConnect	198	182	233	10	202	221
			firstReactRender	28	18	49	9	33	47
			getState	29	15	89	12	32	46
			initialActions	1	0	9	1	1	2
			loadScripts	847	648	1023	95	919	997
			setupStore	11	6	24	3	12	18
			numNetworkReqs	12	5	78	21	5	74
	Browserify	Power User Home	uiStartup	1848	1526	2817	267	2007	2450
			load	1000	878	1747	168	1001	1457
			domContentLoaded	986	866	1734	166	983	1444
			domInteractive	36	17	178	37	29	146
			firstPaint	534	84	1746	423	910	1467
			backgroundConnect	219	201	253	10	225	241
			firstReactRender	77	45	144	16	80	116
			getState	173	124	318	37	197	246
			initialActions	1	0	4	1	1	2
			loadScripts	783	668	1530	165	777	1235
			setupStore	19	10	44	9	24	37
			numNetworkReqs	108	62	290	46	122	195
	Webpack	Standard Home	uiStartup	826	747	1052	76	855	1007
			load	626	575	826	61	632	790
			domContentLoaded	622	573	818	60	627	781
			domInteractive	25	14	96	17	21	77
			firstPaint	252	75	817	191	218	698
			backgroundConnect	12	6	38	8	11	31
			firstReactRender	30	21	73	7	34	38
			getState	30	14	61	11	40	47
			initialActions	1	0	4	1	1	2
			loadScripts	619	571	809	58	625	771
			setupStore	12	5	39	5	14	22
			numNetworkReqs	12	5	75	19	5	69
	Webpack	Power User Home	uiStartup	1444	1111	2729	280	1573	2080
			load	664	568	1496	151	682	1014
			domContentLoaded	653	560	1485	150	666	1005
			domInteractive	34	16	170	33	30	124
			firstPaint	340	94	1131	227	571	770
			backgroundConnect	15	7	48	7	19	29
			firstReactRender	79	47	104	11	86	97
			getState	166	137	351	37	164	264
			initialActions	1	0	2	0	1	2
			loadScripts	650	559	1478	147	663	994
			setupStore	21	8	84	14	31	47
			numNetworkReqs	151	66	309	57	189	290
Firefox	Browserify	Standard Home	uiStartup	1254	1049	1751	124	1307	1539
			load	1066	905	1277	82	1129	1221
			domContentLoaded	1065	901	1277	82	1129	1221
			domInteractive	57	32	176	30	85	111
			firstPaint	-	-	-	-	-	-
			backgroundConnect	37	20	146	19	38	71
			firstReactRender	23	19	53	6	23	37
			getState	11	6	195	19	9	20
			initialActions	1	0	3	0	1	2
			loadScripts	1044	890	1250	77	1105	1197
			setupStore	10	5	33	5	10	26
			numNetworkReqs	12	5	67	16	6	61
	Browserify	Power User Home	uiStartup	2694	2087	3928	332	2872	3478
			load	1207	959	1691	185	1260	1600
			domContentLoaded	1206	958	1691	185	1260	1600
			domInteractive	141	34	659	133	152	498
			firstPaint	-	-	-	-	-	-
			backgroundConnect	222	19	1059	248	249	808
			firstReactRender	84	39	156	19	91	120
			getState	232	73	880	238	189	846
			initialActions	2	0	8	1	2	7
			loadScripts	1158	944	1668	174	1194	1545
			setupStore	113	6	781	167	122	701
			numNetworkReqs	87	52	213	41	86	198
	Webpack	Standard Home	uiStartup	1500	1288	2225	147	1555	1768
			load	1280	1126	1529	95	1338	1463
			domContentLoaded	1280	1126	1529	95	1337	1463
			domInteractive	68	29	181	36	94	135
			firstPaint	-	-	-	-	-	-
			backgroundConnect	44	20	268	35	45	88
			firstReactRender	31	22	166	21	29	66
			getState	15	6	177	22	13	46
			initialActions	1	0	2	0	2	2
			loadScripts	1256	1109	1496	92	1315	1439
			setupStore	13	6	70	11	12	41
			numNetworkReqs	12	5	70	17	6	66
	Webpack	Power User Home	uiStartup	2894	2090	3796	336	3081	3564
			load	1456	1151	2071	209	1648	1856
			domContentLoaded	1456	1150	2070	209	1648	1856
			domInteractive	139	31	656	135	154	502
			firstPaint	-	-	-	-	-	-
			backgroundConnect	174	29	957	185	193	598
			firstReactRender	84	41	184	19	94	116
			getState	265	73	906	264	223	858
			initialActions	4	1	60	7	3	7
			loadScripts	1418	1135	2041	210	1608	1826
			setupStore	105	4	786	169	95	574
			numNetworkReqs	87	52	229	43	84	197

📊 Page Load Benchmark Results

Current Commit: 68e28d9 | Date: 11/21/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

pageLoadTime-> current mean value: 1.08s (±73ms) 🟡 | historical mean value: 1.05s ⬆️ (historical data)
domContentLoaded-> current mean value: 754ms (±70ms) 🟢 | historical mean value: 731ms ⬆️ (historical data)
firstContentfulPaint-> current mean value: 80ms (±14ms) 🟢 | historical mean value: 80ms ⬆️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.08s	73ms	1.03s	1.43s	1.29s	1.43s
domContentLoaded	754ms	70ms	715ms	1.09s	954ms	1.09s
firstPaint	80ms	14ms	64ms	204ms	88ms	204ms
firstContentfulPaint	80ms	14ms	64ms	204ms	88ms	204ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

metamaskbot added the team-extension-platform Extension Platform team label Nov 21, 2025

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MajorLift force-pushed the jongsun/build/webpack/react-compiler-debug-mode branch 2 times, most recently from ac67db5 to 3f87f45 Compare November 21, 2025 13:01

MajorLift force-pushed the jongsun/build/webpack/react-compiler-debug-mode branch from 3f87f45 to 5d08e68 Compare November 21, 2025 18:45

MajorLift changed the title ~~build(webpack): React Compiler debug mode~~ build(webpack): Add verbose, debug modes for React Compiler Webpack loader Nov 21, 2025

MajorLift mentioned this pull request Nov 21, 2025

build: Enable React Compiler for Webpack builds #38007

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MajorLift force-pushed the jongsun/build/webpack/react-compiler-debug-mode branch 2 times, most recently from 8dc6a66 to aaabb13 Compare November 21, 2025 19:41

MajorLift added 3 commits November 21, 2025 15:50

Define reactCompilerLoader, ReactCompilerLogger

addb658

Add reactCompilerVerbose cli argument

9b0611f

Set up loader, logger in webpack config

68e28d9

MajorLift force-pushed the jongsun/build/webpack/react-compiler-debug-mode branch from aaabb13 to 68e28d9 Compare November 21, 2025 20:51

MajorLift merged commit 5723799 into jongsun/build/enable-react-compiler-webpack Nov 21, 2025
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MajorLift deleted the jongsun/build/webpack/react-compiler-debug-mode branch November 21, 2025 20:57

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build(webpack): Add verbose, debug modes for React Compiler Webpack loader #38119

build(webpack): Add verbose, debug modes for React Compiler Webpack loader #38119

MajorLift commented Nov 21, 2025 •

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📄 Localhost MetaMask Test Dapp

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📄 Localhost MetaMask Test Dapp

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build(webpack): Add verbose, debug modes for React Compiler Webpack loader #38119

build(webpack): Add verbose, debug modes for React Compiler Webpack loader #38119

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metamaskbot commented Nov 21, 2025

📄 Localhost MetaMask Test Dapp

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metamaskbot commented Nov 21, 2025

📄 Localhost MetaMask Test Dapp

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📄 Localhost MetaMask Test Dapp

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MajorLift commented Nov 21, 2025 •

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