metamask-extension fix: dismiss import nft modal on timeout

Description

The import NFT modal does not dismiss on Firefox/Sepolia. Added a timeout to automatically close the modal if the call to get details hangs.

Changelog

CHANGELOG entry: Fixes hanging import nft modal on Sepolia/firefox

Related issues

Fixes: https://github.com/MetaMask/metamask-extension/issues/29633

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.

[!NOTE] Adds a 3-second timeout around fetching NFT token standard/details in the Import NFTs modal to prevent hanging.

Frontend

Import NFTs Modal (ui/components/multichain/import-nfts-modal/import-nfts-modal.js):

Wrap getTokenStandardAndDetails with Promise.race to enforce a 3s timeout; fall back to {} on error/timeout.

No changes to import flow; metrics still tracked using resolved tokenDetails when available.

^{Written by Cursor Bugbot for commit bf062eec1ae3c7a4b635ffd19fefabd4bb05abd7. This will update automatically on new commits. Configure here.}

Dec 10 '25 13:12 sahar-fehri

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.

Dec 10 '25 13:12 github-actions[bot]

✨ Files requiring CODEOWNER review ✨

👨‍🔧 @MetaMask/core-extension-ux (1 files, +9 -5)

📁 ui/
- 📁 components/
  - 📁 multichain/
    - 📁 import-nfts-modal/
      - 📄 import-nfts-modal.js +9 -5

Dec 10 '25 13:12 metamaskbot

Builds ready [bf062ee]

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 (1252 ± 102 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	1252	1029	1485	102	1325	1397
			load	1032	867	1226	83	1080	1195
			domContentLoaded	1026	862	1217	82	1072	1188
			domInteractive	25	15	100	19	21	79
			firstPaint	529	142	1233	408	1031	1170
			backgroundConnect	215	197	290	14	220	240
			firstReactRender	47	31	80	11	55	70
			getState	35	18	70	11	42	57
			initialActions	1	0	6	1	1	3
			loadScripts	817	652	1007	80	858	975
			setupStore	12	6	36	6	14	27
			numNetworkReqs	13	6	76	19	6	69
	Browserify	Power User Home	uiStartup	1949	1552	2655	169	2020	2252
			load	1102	896	1681	142	1186	1322
			domContentLoaded	1093	891	1671	141	1179	1313
			domInteractive	31	17	124	22	28	91
			firstPaint	529	99	1683	420	1008	1300
			backgroundConnect	258	197	747	98	244	549
			firstReactRender	47	39	76	5	49	59
			getState	209	150	752	95	215	284
			initialActions	1	0	5	1	1	2
			loadScripts	874	690	1427	139	961	1101
			setupStore	14	6	37	5	14	27
			numNetworkReqs	70	58	154	18	68	120
	Webpack	Standard Home	uiStartup	821	682	1150	89	891	982
			load	667	575	1007	87	729	825
			domContentLoaded	661	570	995	87	725	819
			domInteractive	25	15	98	19	22	86
			firstPaint	254	74	868	192	230	706
			backgroundConnect	11	6	32	6	13	27
			firstReactRender	54	33	262	37	55	135
			getState	28	14	56	11	38	49
			initialActions	1	0	4	1	1	2
			loadScripts	658	568	989	86	723	811
			setupStore	11	6	30	4	13	19
			numNetworkReqs	14	6	81	20	6	77
	Webpack	Power User Home	uiStartup	1501	1116	2158	209	1665	1833
			load	770	622	1250	120	886	958
			domContentLoaded	762	616	1245	119	878	946
			domInteractive	34	18	150	28	28	109
			firstPaint	355	89	1075	251	643	895
			backgroundConnect	87	7	694	177	55	641
			firstReactRender	53	42	86	7	56	66
			getState	198	143	355	41	209	275
			initialActions	1	0	2	0	1	2
			loadScripts	758	613	1235	118	871	942
			setupStore	16	7	51	9	15	37
			numNetworkReqs	74	57	241	35	65	174
Firefox	Browserify	Standard Home	uiStartup	1325	1072	1951	176	1399	1708
			load	1061	902	1319	90	1115	1235
			domContentLoaded	1061	901	1319	90	1115	1235
			domInteractive	65	31	212	38	85	139
			firstPaint	-	-	-	-	-	-
			backgroundConnect	56	22	342	57	60	194
			firstReactRender	43	31	497	46	44	58
			getState	14	7	160	16	14	26
			initialActions	1	0	3	1	2	2
			loadScripts	1032	884	1262	81	1089	1190
			setupStore	15	5	199	22	13	52
			numNetworkReqs	15	6	83	21	8	76
	Browserify	Power User Home	uiStartup	2663	1611	3709	538	3054	3409
			load	1673	931	2567	498	2088	2501
			domContentLoaded	1673	931	2566	497	2087	2501
			domInteractive	159	32	1071	260	105	949
			firstPaint	-	-	-	-	-	-
			backgroundConnect	173	27	1149	209	182	951
			firstReactRender	56	35	110	13	61	89
			getState	130	69	270	42	158	215
			initialActions	3	1	41	6	2	7
			loadScripts	1604	916	2542	476	2004	2375
			setupStore	48	4	1097	119	42	190
			numNetworkReqs	73	51	139	21	80	118
	Webpack	Standard Home	uiStartup	1512	1255	1980	139	1546	1793
			load	1253	1092	1549	97	1307	1420
			domContentLoaded	1253	1092	1549	97	1306	1420
			domInteractive	65	27	157	35	86	130
			firstPaint	-	-	-	-	-	-
			backgroundConnect	53	19	201	37	55	130
			firstReactRender	43	31	103	12	45	78
			getState	14	6	61	11	15	46
			initialActions	1	0	2	0	2	2
			loadScripts	1222	1078	1497	87	1280	1388
			setupStore	16	5	140	21	12	48
			numNetworkReqs	15	6	82	21	9	76
	Webpack	Power User Home	uiStartup	2923	1902	4432	583	3385	3829
			load	1970	1177	3298	535	2406	2720
			domContentLoaded	1970	1177	3297	535	2405	2720
			domInteractive	222	30	1112	321	163	989
			firstPaint	-	-	-	-	-	-
			backgroundConnect	185	31	1235	222	216	970
			firstReactRender	62	43	131	15	65	96
			getState	143	78	283	55	183	259
			initialActions	3	1	40	5	2	3
			loadScripts	1883	1159	3097	506	2333	2618
			setupStore	58	6	1042	127	50	300
			numNetworkReqs	75	52	139	25	68	128

📊 Page Load Benchmark Results

Current Commit: bf062ee | Date: 12/10/2025

📄 Localhost MetaMask Test Dapp

Samples: 100

Summary

pageLoadTime-> current mean value: 1.03s (±42ms) 🟡 | historical mean value: 1.04s ⬇️ (historical data)
domContentLoaded-> current mean value: 716ms (±39ms) 🟢 | historical mean value: 724ms ⬇️ (historical data)
firstContentfulPaint-> current mean value: 76ms (±10ms) 🟢 | historical mean value: 78ms ⬇️ (historical data)

📈 Detailed Results

Metric	Mean	Std Dev	Min	Max	P95	P99
pageLoadTime	1.03s	42ms	1.00s	1.34s	1.07s	1.34s
domContentLoaded	716ms	39ms	692ms	1.01s	746ms	1.01s
firstPaint	76ms	10ms	56ms	148ms	88ms	148ms
firstContentfulPaint	76ms	10ms	56ms	148ms	88ms	148ms
largestContentfulPaint	0ms	0ms	0ms	0ms	0ms	0ms

Bundle size diffs [🚀 Bundle size reduced!]

background: 116 Bytes (0%)
ui: -2.28 KiB (-0.03%)
common: -582 Bytes (-0.01%)

Dec 10 '25 14:12 metamaskbot